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x in (-oo:+oo)
x/5-((2*x)/3) = 4 // - 4
x/5-((2*x)/3)-4 = 0
x/5+(-2/3)*x-4 = 0
-7/15*x-4 = 0 // + 4
-7/15*x = 4 // : -7/15
x = 4/(-7/15)
x = -60/7
x = -60/7
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