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x in (-oo:+oo)
3/10-5*x = -69/20 // + -69/20
3/10-5*x-(-69/20) = 0
3/10-5*x+69/20 = 0
15/4-5*x = 0 // - 15/4
-5*x = -15/4 // : -5
x = -15/4/(-5)
x = 3/4
x = 3/4
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