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2*x-((3/3)*x)+(6/4)*x-1+7 = 0
2*x-x+(6/4)*x-1+7 = 0
5/2*x+6 = 0 // - 6
5/2*x = -6 // : 5/2
x = -6/5/2
x = -12/5
x = -12/5
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