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x in (-oo:+oo)
7*(2*x+6) = 112 // - 112
7*(2*x+6)-112 = 0
7*(2*x+6)-112 = 0
14*x-70 = 0
14*x-70 = 0
14*x-70 = 0 // + 70
14*x = 70 // : 14
x = 70/14
x = 5
x = 5
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