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x in (-oo:+oo)
70000 = (5/3)*x // - (5/3)*x
70000-((5/3)*x) = 0
(-5/3)*x+70000 = 0
70000-5/3*x = 0 // - 70000
-5/3*x = -70000 // : -5/3
x = -70000/(-5/3)
x = 42000
x = 42000
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