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x in (-oo:+oo)
5*(3*x+10) = 5 // - 5
5*(3*x+10)-5 = 0
5*(3*x+10)-5 = 0
15*x+45 = 0
15*x+45 = 0
15*x+45 = 0 // - 45
15*x = -45 // : 15
x = -45/15
x = -3
x = -3
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