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8x-10=-2x-30
We move all terms to the left:
8x-10-(-2x-30)=0
We get rid of parentheses
8x+2x+30-10=0
We add all the numbers together, and all the variables
10x+20=0
We move all terms containing x to the left, all other terms to the right
10x=-20
x=-20/10
x=-2
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