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x in (-oo:+oo)
x/5-22+15 = -12-4 // + -12-4
x/5-22+4+12+15 = 0
1/5*x+9 = 0 // - 9
1/5*x = -9 // : 1/5
x = -9/1/5
x = -45
x = -45
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