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(-6/7)*x+3/4 = 51/196 // - 51/196
(-6/7)*x+3/4-(51/196) = 0
(-6/7)*x+3/4-51/196 = 0
24/49-6/7*x = 0 // - 24/49
-6/7*x = -24/49 // : -6/7
x = -24/49/(-6/7)
x = 4/7
x = 4/7
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