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2*x+(6/2)*x-((7*x)/(-5))+2*x+5+5 = 0
2*x+(6/2)*x+(7/5)*x+2*x+5+5 = 0
42/5*x+10 = 0 // - 10
42/5*x = -10 // : 42/5
x = -10/42/5
x = -25/21
x = -25/21
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