76. 6a-3c+4b-4a-6c+4b-3c+4a-9+6a+9. 77. 7a+9abc-3+6a-4abc+123a+2abc +9 -3abc.

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

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

34ab+17ac- 11cx- 4.a 39ax by+4x+ 8 17ab-34ac+ 12cx+ 5a 17ax+12by-2cx-12 -84ab+17ac- 13cx- 17a -19ax-11by-7cm-11 -119ac+120cx+120a 37ax-10by+9cx - 9 17cx+12a-41ax+11by- cx+10

8ab

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.

14ab31bc-42cd+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+16bx-18ax +18by -34αx+17bx-27-8by.

100. 3a+4b+15cx+17a+3b18cx+16a 176 +11a-12c.