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75=3x+4(-4x-17)
We move all terms to the left:
75-(3x+4(-4x-17))=0
We calculate terms in parentheses: -(3x+4(-4x-17)), so:We get rid of parentheses
3x+4(-4x-17)
We multiply parentheses
3x-16x-68
We add all the numbers together, and all the variables
-13x-68
Back to the equation:
-(-13x-68)
13x+68+75=0
We add all the numbers together, and all the variables
13x+143=0
We move all terms containing x to the left, all other terms to the right
13x=-143
x=-143/13
x=-11
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