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5x-3x=12+30
We move all terms to the left:
5x-3x-(12+30)=0
We add all the numbers together, and all the variables
5x-3x-42=0
We add all the numbers together, and all the variables
2x-42=0
We move all terms containing x to the left, all other terms to the right
2x=42
x=42/2
x=21
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