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3.5x+10=(-30)
We move all terms to the left:
3.5x+10-((-30))=0
We add all the numbers together, and all the variables
3.5x+40=0
We move all terms containing x to the left, all other terms to the right
3.5x=-40
x=-40/3.5
x=-11+1/2.3333333333333
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