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y in (-oo:+oo)
y/4 = 5.4 // - 5.4
y/4-5.4 = 0
1/4*y-5.4 = 0 // + 5.4
1/4*y = 5.4 // : 1/4
y = 5.4/1/4
y = 21.6
y = 21.6
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