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x in (-oo:+oo)
x/28 = 56/14 // - 56/14
x/28-(56/14) = 0
x/28-4 = 0
1/28*x-4 = 0 // + 4
1/28*x = 4 // : 1/28
x = 4/1/28
x = 112
x = 112
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