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8x+30=4x-10
We move all terms to the left:
8x+30-(4x-10)=0
We get rid of parentheses
8x-4x+10+30=0
We add all the numbers together, and all the variables
4x+40=0
We move all terms containing x to the left, all other terms to the right
4x=-40
x=-40/4
x=-10
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