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y in (-oo:+oo)
4*((13*y)/4)-(4*y) = 18 // - 18
4*((13*y)/4)-(4*y)-18 = 0
4*((13*y)/4)-4*y-18 = 0
9*y-18 = 0 // + 18
9*y = 18 // : 9
y = 18/9
y = 2
y = 2
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