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x in (-oo:+oo)
(-3/5)*x = -9/20 // + -9/20
(-3/5)*x-(-9/20) = 0
(-3/5)*x+9/20 = 0
9/20-3/5*x = 0 // - 9/20
-3/5*x = -9/20 // : -3/5
x = -9/20/(-3/5)
x = 3/4
x = 3/4
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