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(-2/3)*x+2 = 10/7 // - 10/7
(-2/3)*x-(10/7)+2 = 0
(-2/3)*x-10/7+2 = 0
4/7-2/3*x = 0 // - 4/7
-2/3*x = -4/7 // : -2/3
x = -4/7/(-2/3)
x = 6/7
x = 6/7
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