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(2*x)/3-((4*x)/5) = 4 // - 4
(2*x)/3-((4*x)/5)-4 = 0
(2*x)/3+(-4/5)*x-4 = 0
-2/15*x-4 = 0 // + 4
-2/15*x = 4 // : -2/15
x = 4/(-2/15)
x = -30
x = -30
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