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y in (-oo:+oo)
1-((3*y)/5)-4 = (2*y)/3 // - (2*y)/3
1-((3*y)/5)-((2*y)/3)-4 = 0
(-3/5)*y+(-2/3)*y-4+1 = 0
-19/15*y-3 = 0 // + 3
-19/15*y = 3 // : -19/15
y = 3/(-19/15)
y = -45/19
y = -45/19
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