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x in (-oo:+oo)
x/10 = (4*x)/9-31 // - (4*x)/9-31
x/10-((4*x)/9)+31 = 0
x/10+(-4/9)*x+31 = 0
31-31/90*x = 0 // - 31
-31/90*x = -31 // : -31/90
x = -31/(-31/90)
x = 90
x = 90
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