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8-((7/10)*x) = 6-((1/5)*x) // - 6-((1/5)*x)
(1/5)*x-((7/10)*x)-6+8 = 0
(-7/10)*x+(1/5)*x-6+8 = 0
2-1/2*x = 0 // - 2
-1/2*x = -2 // : -1/2
x = -2/(-1/2)
x = 4
x = 4
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