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x in (-oo:+oo)
4*(5*x-1) = 56 // - 56
4*(5*x-1)-56 = 0
4*(5*x-1)-56 = 0
20*x-60 = 0
20*x-60 = 0
20*x-60 = 0 // + 60
20*x = 60 // : 20
x = 60/20
x = 3
x = 3
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