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6-((7*x)/10) = -x/5 // + -x/5
6-((7*x)/10)-(-x/5) = 0
(-7/10)*x+(1/5)*x+6 = 0
6-1/2*x = 0 // - 6
-1/2*x = -6 // : -1/2
x = -6/(-1/2)
x = 12
x = 12
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