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y in (-oo:+oo)
-((7/4)*y)-4/3 = -9/5 // + -9/5
-((7/4)*y)-4/3-(-9/5) = 0
(-7/4)*y-4/3+9/5 = 0
7/15-7/4*y = 0 // - 7/15
-7/4*y = -7/15 // : -7/4
y = -7/15/(-7/4)
y = 4/15
y = 4/15
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