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-5x+70=-15x-210
We move all terms to the left:
-5x+70-(-15x-210)=0
We get rid of parentheses
-5x+15x+210+70=0
We add all the numbers together, and all the variables
10x+280=0
We move all terms containing x to the left, all other terms to the right
10x=-280
x=-280/10
x=-28
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