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x in (-oo:+oo)
x/7 = -3/8 // + -3/8
x/7-(-3/8) = 0
x/7+3/8 = 0
1/7*x+3/8 = 0 // - 3/8
1/7*x = -3/8 // : 1/7
x = -3/8/1/7
x = -21/8
x = -21/8
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