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2x-6+2x-6+3x+15+3x+15=58
We move all terms to the left:
2x-6+2x-6+3x+15+3x+15-(58)=0
We add all the numbers together, and all the variables
10x-40=0
We move all terms containing x to the left, all other terms to the right
10x=40
x=40/10
x=4
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