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