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(1/6)*x+(2/5)*x-((8/3)*x)-10+42 = 0
(1/6)*x+(2/5)*x+(-8/3)*x-10+42 = 0
32-21/10*x = 0 // - 32
-21/10*x = -32 // : -21/10
x = -32/(-21/10)
x = 320/21
x = 320/21
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