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x-45=x+15+4x-45=x+15+4x-45
We move all terms to the left:
x-45-(x+15+4x-45)=0
We add all the numbers together, and all the variables
x-(5x-30)-45=0
We get rid of parentheses
x-5x+30-45=0
We add all the numbers together, and all the variables
-4x-15=0
We move all terms containing x to the left, all other terms to the right
-4x=15
x=15/-4
x=-3+3/4
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