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(7*(x+4))/2 = -7 // + 7
(7*(x+4))/2+7 = 0
(7*(x+4))/2+(2*7)/2 = 0
7*(x+4)+2*7 = 0
7*x+42 = 0
(7*x+42)/2 = 0
(7*x+42)/2 = 0 // * 2
7*x+42 = 0
7*x+42 = 0 // - 42
7*x = -42 // : 7
x = -42/7
x = -6
x = -6
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