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14*y-12 = (4/5)*(10*y+30) // - (4/5)*(10*y+30)
14*y-((4/5)*(10*y+30))-12 = 0
(-4/5)*(10*y+30)+14*y-12 = 0
14*y-4/5*(10*y+30)-12 = 0
14*y-4/5*(10*y+30)-12 = 0
6*y-24-12 = 0
6*y-36 = 0
6*y-36 = 0
6*y-36 = 0 // + 36
6*y = 36 // : 6
y = 36/6
y = 6
y = 6
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