5x+10=40
5x+10-10=40-10
5x=30
5x/5=30/5
x=6
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5x + 32 = 11x - 105x - 11x = -10 - 32-6x = -42x = 7
x=6
There are 2 unknowns
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.
3x-4=5x+6 gives: 2x=-10 which gives x=-5