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76. 6a-3c+4b-4a-6c+4b-3c+4a-9+6a+9. 77. 7a+9abc-3+6a-4abc+12 — 3a+2abc+9 -3abc.

78. 3x+4xy-6y+6x-3xy+4y-6xy+4y-7x +9xy-y.

79. 9x2yz+11xyz-8x+4x2yz−8xyz+7x—8xyz.

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84.

85.

34ab+17ac- 11cx

4.a

39ax-by+4cx+ 8

17ab-34ac + 12cx+ 5a 17ax+12by-2cx-12 -84ab+17ac- 13cx- 17a -19ax-11by-7cx-11 -119ac+120cx+120a 37ax-10by+9cx 17ca12a-41ax+11by- cx+10

8ab

9

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-987ab-24by-11cy

9ax+2ab4abx- 7

7-8ab+17by- 9cy

-8-9ab-34by-12cy -3ax -3ab. 3abx- 8

−2ax+6ab+ 6аbx- 4

-9+12ab-8by+10cy

-4ax-7ab- 7abx- 7

Add together the following quantities:-

90. 67 pigs, 39 cows, 3 sheep, 11 pigs, 7 cows, 6 horses, 37 pigs, and 27 horses.

91. 3 bricklayers, 14 carpenters, 71 masons, 3 carpenters, 6 bricklayers, 4 carpenters, and 64 labourers.

92.

3a+4b-bc+4ax-7a-+8c-14b+6c+8ax.

93. 34ab27bc+37cd-84bc+64ab-37bc+48cd. 14ab31bc42cd+8ac + 15ab61bc+84cd

94.

-7ac+6.

95. 37ac+37ax +41bx - 71ac +67ax+84bx — 32ac +64bx+7.

96. (3a+4b-c) (8b+6a+3c) - (a+b+c) + (4a-3b+6c).

97. (3+19+7) (6+3+4+9) − (a + b + c)

-(3+a+7)-(4a+2b+3c)+4a+6b+3c.

98. a+b+c-3a+4b+61c-17+4a2+3a — 17b +14c.

99. 21+ ax + bx+by - 17+166x-18ax +18by -34ax+17bx-27-8by.

100. 3a+4b+15cx+17a+3b − 18cx+16a — 17b +11a-12c.

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