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28-3x=-3x-4(4x+5)
We move all terms to the left:
28-3x-(-3x-4(4x+5))=0
We calculate terms in parentheses: -(-3x-4(4x+5)), so:We get rid of parentheses
-3x-4(4x+5)
We multiply parentheses
-3x-16x-20
We add all the numbers together, and all the variables
-19x-20
Back to the equation:
-(-19x-20)
-3x+19x+20+28=0
We add all the numbers together, and all the variables
16x+48=0
We move all terms containing x to the left, all other terms to the right
16x=-48
x=-48/16
x=-3
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