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x in (-oo:+oo)
4*(x-6) = 48/12 // - 48/12
4*(x-6)-(48/12) = 0
4*(x-6)-4 = 0
4*(x-6)-4 = 0
4*x-28 = 0
4*x-28 = 0
4*x-28 = 0 // + 28
4*x = 28 // : 4
x = 28/4
x = 7
x = 7
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