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