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(-7/2)*(6/7-2*x)-3 = 0
-7/2*(6/7-2*x)-3 = 0
-7/2*(6/7-2*x)-3 = 0
7*x-6 = 0
7*x-6 = 0
7*x-6 = 0 // + 6
7*x = 6 // : 7
x = 6/7
x = 6/7
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