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128=5x+11+8x
We move all terms to the left:
128-(5x+11+8x)=0
We add all the numbers together, and all the variables
-(13x+11)+128=0
We get rid of parentheses
-13x-11+128=0
We add all the numbers together, and all the variables
-13x+117=0
We move all terms containing x to the left, all other terms to the right
-13x=-117
x=-117/-13
x=+9
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