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(4/5)*y-3 = (2/3)*y+4 // - (2/3)*y+4
(4/5)*y-((2/3)*y)-4-3 = 0
(4/5)*y+(-2/3)*y-4-3 = 0
2/15*y-7 = 0 // + 7
2/15*y = 7 // : 2/15
y = 7/2/15
y = 105/2
y = 105/2
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