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66=-3x-5(2x+5)
We move all terms to the left:
66-(-3x-5(2x+5))=0
We calculate terms in parentheses: -(-3x-5(2x+5)), so:We get rid of parentheses
-3x-5(2x+5)
We multiply parentheses
-3x-10x-25
We add all the numbers together, and all the variables
-13x-25
Back to the equation:
-(-13x-25)
13x+25+66=0
We add all the numbers together, and all the variables
13x+91=0
We move all terms containing x to the left, all other terms to the right
13x=-91
x=-91/13
x=-7
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