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x in (-oo:+oo)
x-((30/100)*x) = 124 // - 124
x-((30/100)*x)-124 = 0
x+(-3/10)*x-124 = 0
7/10*x-124 = 0 // + 124
7/10*x = 124 // : 7/10
x = 124/7/10
x = 1240/7
x = 1240/7
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