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5x=135-4x
We move all terms to the left:
5x-(135-4x)=0
We add all the numbers together, and all the variables
5x-(-4x+135)=0
We get rid of parentheses
5x+4x-135=0
We add all the numbers together, and all the variables
9x-135=0
We move all terms containing x to the left, all other terms to the right
9x=135
x=135/9
x=15
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