x = 4
9x = 7x + 8. Subtract 7x from both sides. This leaves 2x = 8. Then divide both sides by 2 to get x by itself. So, x = 4.
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7x-3=3x+8 7x-3x=8+3 4x=11 x=11/4=2.75
7x + 8 = 10x - 2 ∴ 3x = 10 ∴ x = 10/3
9x + 8y = (9 x 6) + (8 x 3) = 54 + 24 = 78
9x+4 =x-7 8x=-3 x=-3/8
5x+32+7x+8=180. By the laws of commutativity we can thus say that 12x+40=180. Subtracting 40 we get 12x=140. Divide by 12 and you get x=(do it yourself) This has nothing to do with calculus by the way.