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-15x-40=6x-70
We move all terms to the left:
-15x-40-(6x-70)=0
We get rid of parentheses
-15x-6x+70-40=0
We add all the numbers together, and all the variables
-21x+30=0
We move all terms containing x to the left, all other terms to the right
-21x=-30
x=-30/-21
x=1+3/7
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