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13+x-15=18-3x
We move all terms to the left:
13+x-15-(18-3x)=0
We add all the numbers together, and all the variables
x-(-3x+18)+13-15=0
We add all the numbers together, and all the variables
x-(-3x+18)-2=0
We get rid of parentheses
x+3x-18-2=0
We add all the numbers together, and all the variables
4x-20=0
We move all terms containing x to the left, all other terms to the right
4x=20
x=20/4
x=5
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