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28=-7(2x+3)
We move all terms to the left:
28-(-7(2x+3))=0
We calculate terms in parentheses: -(-7(2x+3)), so:We get rid of parentheses
-7(2x+3)
We multiply parentheses
-14x-21
Back to the equation:
-(-14x-21)
14x+21+28=0
We add all the numbers together, and all the variables
14x+49=0
We move all terms containing x to the left, all other terms to the right
14x=-49
x=-49/14
x=-3+1/2
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