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x in (-oo:+oo)
4*(x-4) = 48/12 // - 48/12
4*(x-4)-(48/12) = 0
4*(x-4)-4 = 0
4*(x-4)-4 = 0
4*x-20 = 0
4*x-20 = 0
4*x-20 = 0 // + 20
4*x = 20 // : 4
x = 20/4
x = 5
x = 5
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