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70-4x=30+4x
We move all terms to the left:
70-4x-(30+4x)=0
We add all the numbers together, and all the variables
-4x-(4x+30)+70=0
We get rid of parentheses
-4x-4x-30+70=0
We add all the numbers together, and all the variables
-8x+40=0
We move all terms containing x to the left, all other terms to the right
-8x=-40
x=-40/-8
x=+5
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