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x in (-oo:+oo)
1.3*(x/4) = 200 // - 200
1.3*(x/4)-200 = 0
0.325*x-200 = 0 // + 200
0.325*x = 200 // : 0.325
x = 200/0.325
x = 615.38461538
x = 615.38461538
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