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-20+3x=-4(5+x)
We move all terms to the left:
-20+3x-(-4(5+x))=0
We add all the numbers together, and all the variables
3x-(-4(x+5))-20=0
We calculate terms in parentheses: -(-4(x+5)), so:We get rid of parentheses
-4(x+5)
We multiply parentheses
-4x-20
Back to the equation:
-(-4x-20)
3x+4x+20-20=0
We add all the numbers together, and all the variables
7x=0
x=0/7
x=0
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