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x in (-oo:+oo)
x/4 = -42/24 // + -42/24
x/4-(-42/24) = 0
x/4+7/4 = 0
1/4*x+7/4 = 0 // - 7/4
1/4*x = -7/4 // : 1/4
x = -7/4/1/4
x = -7
x = -7
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