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x in (-oo:+oo)
x+7*((x/30)/8.5) = 10000 // - 10000
x+7*((x/30)/8.5)-10000 = 0
1.02745099*x-10000 = 0 // + 10000
1.02745099*x = 10000 // : 1.02745099
x = 10000/1.02745099
x = 9732.82433647
x = 9732.82433647
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