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