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x in (-oo:+oo)
6*(2*x+2) = 48 // - 48
6*(2*x+2)-48 = 0
6*(2*x+2)-48 = 0
12*x-36 = 0
12*x-36 = 0
12*x-36 = 0 // + 36
12*x = 36 // : 12
x = 36/12
x = 3
x = 3
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