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x in (-oo:+oo)
x/2-250 = (3*x)/7 // - (3*x)/7
x/2-((3*x)/7)-250 = 0
x/2+(-3/7)*x-250 = 0
1/14*x-250 = 0 // + 250
1/14*x = 250 // : 1/14
x = 250/1/14
x = 3500
x = 3500
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