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15-2x=7x-3
We move all terms to the left:
15-2x-(7x-3)=0
We get rid of parentheses
-2x-7x+3+15=0
We add all the numbers together, and all the variables
-9x+18=0
We move all terms containing x to the left, all other terms to the right
-9x=-18
x=-18/-9
x=+2
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