Think of this a 12 x-rays + 5 x-rays
Makes 17 x-rays.
12x+5x=17x
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5x-8 + 7x 12x-8 12x = 8 x = 8/12 x= 2/3
i got x = 1.35 12x+18=41-5x +5x 17x+18=41 -18 17x=23 /17 x=1.35
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.
7
12x+x = 13x