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