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7+13=-4(9x-5)
We move all terms to the left:
7+13-(-4(9x-5))=0
We add all the numbers together, and all the variables
-(-4(9x-5))+20=0
We calculate terms in parentheses: -(-4(9x-5)), so:We get rid of parentheses
-4(9x-5)
We multiply parentheses
-36x+20
Back to the equation:
-(-36x+20)
36x-20+20=0
We add all the numbers together, and all the variables
36x=0
x=0/36
x=0
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