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3x+15=86+64
We move all terms to the left:
3x+15-(86+64)=0
We add all the numbers together, and all the variables
3x+15-150=0
We add all the numbers together, and all the variables
3x-135=0
We move all terms containing x to the left, all other terms to the right
3x=135
x=135/3
x=45
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