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x in (-oo:+oo)
x/4-3.5 = -9.9 // + 9.9
x/4-3.5+9.9 = 0
1/4*x+6.4 = 0 // - 6.4
1/4*x = -6.4 // : 1/4
x = -6.4/1/4
x = -25.6
x = -25.6
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