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x in (-oo:+oo)
6*(2*x+1) = 78 // - 78
6*(2*x+1)-78 = 0
6*(2*x+1)-78 = 0
12*x-72 = 0
12*x-72 = 0
12*x-72 = 0 // + 72
12*x = 72 // : 12
x = 72/12
x = 6
x = 6
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