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30=-6(5x+20)
We move all terms to the left:
30-(-6(5x+20))=0
We calculate terms in parentheses: -(-6(5x+20)), so:We get rid of parentheses
-6(5x+20)
We multiply parentheses
-30x-120
Back to the equation:
-(-30x-120)
30x+120+30=0
We add all the numbers together, and all the variables
30x+150=0
We move all terms containing x to the left, all other terms to the right
30x=-150
x=-150/30
x=-5
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