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x in (-oo:+oo)
x/28 = 7/4 // - 7/4
x/28-(7/4) = 0
x/28-7/4 = 0
1/28*x-7/4 = 0 // + 7/4
1/28*x = 7/4 // : 1/28
x = 7/4/1/28
x = 49
x = 49
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