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(1/5)*(10*y+15)-9 = (-1/5)*(5*y-45) // - (-1/5)*(5*y-45)
(1/5)*(10*y+15)-((-1/5)*(5*y-45))-9 = 0
(1/5)*(10*y+15)+(1/5)*(5*y-45)-9 = 0
1/5*(10*y+15)+1/5*(5*y-45)-9 = 0
1/5*(10*y+15)+1/5*(5*y-45)-9 = 0
3*y-9-6 = 0
3*y-15 = 0
3*y-15 = 0
3*y-15 = 0 // + 15
3*y = 15 // : 3
y = 15/3
y = 5
y = 5
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