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x in (-oo:+oo)
x/3+1/4 = 7/12 // - 7/12
x/3+1/4-(7/12) = 0
x/3+1/4-7/12 = 0
1/3*x-1/3 = 0 // + 1/3
1/3*x = 1/3 // : 1/3
x = 1/3/1/3
x = 1
x = 1
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