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(1/6)*x+(2/5)*x-((8/3)*x)-19+42 = 0
(1/6)*x+(2/5)*x+(-8/3)*x-19+42 = 0
23-21/10*x = 0 // - 23
-21/10*x = -23 // : -21/10
x = -23/(-21/10)
x = 230/21
x = 230/21
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