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x in (-oo:+oo)
10*(x/5)-(10*(3/2)) = 10*(3/10) // - 10*(3/10)
10*(x/5)-(10*(3/2))-(10*(3/10)) = 0
10*(x/5)-15-3 = 0
2*x-18 = 0 // + 18
2*x = 18 // : 2
x = 18/2
x = 9
x = 9
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