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-55=3x+8+4x
We move all terms to the left:
-55-(3x+8+4x)=0
We add all the numbers together, and all the variables
-(7x+8)-55=0
We get rid of parentheses
-7x-8-55=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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