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40=-30-5x
We move all terms to the left:
40-(-30-5x)=0
We add all the numbers together, and all the variables
-(-5x-30)+40=0
We get rid of parentheses
5x+30+40=0
We add all the numbers together, and all the variables
5x+70=0
We move all terms containing x to the left, all other terms to the right
5x=-70
x=-70/5
x=-14
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