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y in (-oo:+oo)
3*y-((1/2)*(5*y+15)) = 0
(-1/2)*(5*y+15)+3*y = 0
3*y-1/2*(5*y+15) = 0
3*y-1/2*(5*y+15) = 0
1/2*y-15/2 = 0
1/2*y-15/2 = 0
1/2*y-15/2 = 0 // + 15/2
1/2*y = 15/2 // : 1/2
y = 15/2/1/2
y = 15
y = 15
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