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Anonymous
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.
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5x + 32 = 11x - 105x - 11x = -10 - 32-6x = -42x = 7
x=6
5x+3y
5x = 4x + 9 x = 9
6 + 2x = 5x + 9 , 6 - 9 = 5x - 2x , -3 = 3x , x = -1