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x in (-oo:+oo)
x/2+3/4 = 7/4 // - 7/4
x/2+3/4-(7/4) = 0
x/2+3/4-7/4 = 0
1/2*x-1 = 0 // + 1
1/2*x = 1 // : 1/2
x = 1/1/2
x = 2
x = 2
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