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y in (-oo:+oo)
(2*y)/3-((7*y)/4) = 13 // - 13
(2*y)/3-((7*y)/4)-13 = 0
(2*y)/3+(-7/4)*y-13 = 0
-13/12*y-13 = 0 // + 13
-13/12*y = 13 // : -13/12
y = 13/(-13/12)
y = -12
y = -12
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