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x in (-oo:+oo)
(-2/5)*(10*x-15) = 30 // - 30
(-2/5)*(10*x-15)-30 = 0
-2/5*(10*x-15)-30 = 0
-2/5*(10*x-15)-30 = 0
-4*x-24 = 0
-4*x-24 = 0
-4*x-24 = 0 // + 24
-4*x = 24 // : -4
x = 24/(-4)
x = -6
x = -6
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