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y in (-oo:+oo)
(2/3)*y+7 = (3/5)*y-4 // - (3/5)*y-4
(2/3)*y-((3/5)*y)+4+7 = 0
(2/3)*y+(-3/5)*y+4+7 = 0
1/15*y+11 = 0 // - 11
1/15*y = -11 // : 1/15
y = -11/1/15
y = -165
y = -165
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