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6x-(2x+5)=3x-15
We move all terms to the left:
6x-(2x+5)-(3x-15)=0
We get rid of parentheses
6x-2x-3x-5+15=0
We add all the numbers together, and all the variables
x+10=0
We move all terms containing x to the left, all other terms to the right
x=-10
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