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x in (-oo:+oo)
x-(5*20) = x/3 // - x/3
x-(x/3)-(5*20) = 0
x-(x/3)-100 = 0
2/3*x-100 = 0 // + 100
2/3*x = 100 // : 2/3
x = 100/2/3
x = 150
x = 150
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