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x in (-oo:+oo)
x-((2/3)*x) = 50 // - 50
x-((2/3)*x)-50 = 0
x+(-2/3)*x-50 = 0
1/3*x-50 = 0 // + 50
1/3*x = 50 // : 1/3
x = 50/1/3
x = 150
x = 150
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