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36-7x=-15-5-7

We move all terms to the left:

36-7x-(-15-5-7)=0

We add all the numbers together, and all the variables

-7x+36-(-27)=0

We add all the numbers together, and all the variables

-7x+63=0

We move all terms containing x to the left, all other terms to the right

-7x=-63

x=-63/-7

x=+9

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