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x/4-((2*x)/5) = 6 // - 6
x/4-((2*x)/5)-6 = 0
x/4+(-2/5)*x-6 = 0
-3/20*x-6 = 0 // + 6
-3/20*x = 6 // : -3/20
x = 6/(-3/20)
x = -40
x = -40
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