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x in (-oo:+oo)
x-((9*x)/5) = 70 // - 70
x-((9*x)/5)-70 = 0
x+(-9/5)*x-70 = 0
-4/5*x-70 = 0 // + 70
-4/5*x = 70 // : -4/5
x = 70/(-4/5)
x = -175/2
x = -175/2
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