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15x+15-10x-20+36x-36=204
We move all terms to the left:
15x+15-10x-20+36x-36-(204)=0
We add all the numbers together, and all the variables
41x-245=0
We move all terms containing x to the left, all other terms to the right
41x=245
x=245/41
x=5+40/41
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