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x in (-oo:+oo)
-3*5*(x/2) = 53 // - 53
-3*5*(x/2)-53 = 0
-15/2*x-53 = 0 // + 53
-15/2*x = 53 // : -15/2
x = 53/(-15/2)
x = -106/15
x = -106/15
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