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x in (-oo:+oo)
7*x+8/2 = 3*x+5 // - 3*x+5
7*x-(3*x)+8/2-5 = 0
7*x-3*x+8/2-5 = 0
4*x-1 = 0 // + 1
4*x = 1 // : 4
x = 1/4
x = 1/4
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