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7+-3(x-4)-10=-45
We move all terms to the left:
7+-3(x-4)-10-(-45)=0
We add all the numbers together, and all the variables
-3(x-4)+42=0
We multiply parentheses
-3x+12+42=0
We add all the numbers together, and all the variables
-3x+54=0
We move all terms containing x to the left, all other terms to the right
-3x=-54
x=-54/-3
x=+18
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