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x in (-oo:+oo)
x/4 = 2.5 // - 2.5
x/4-2.5 = 0
1/4*x-2.5 = 0 // + 2.5
1/4*x = 2.5 // : 1/4
x = 2.5/1/4
x = 10
x = 10
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