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7x+3=15x+2x
We move all terms to the left:
7x+3-(15x+2x)=0
We add all the numbers together, and all the variables
7x-(+17x)+3=0
We get rid of parentheses
7x-17x+3=0
We add all the numbers together, and all the variables
-10x+3=0
We move all terms containing x to the left, all other terms to the right
-10x=-3
x=-3/-10
x=3/10
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