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x in (-oo:+oo)
x/4-2 = 7/4 // - 7/4
x/4-(7/4)-2 = 0
x/4-7/4-2 = 0
1/4*x-15/4 = 0 // + 15/4
1/4*x = 15/4 // : 1/4
x = 15/4/1/4
x = 15
x = 15
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