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(9/7)*(5-6*x) = 4 // - 4
(9/7)*(5-6*x)-4 = 0
9/7*(5-6*x)-4 = 0
9/7*(5-6*x)-4 = 0
17/7-54/7*x = 0
17/7-54/7*x = 0
17/7-54/7*x = 0 // - 17/7
-54/7*x = -17/7 // : -54/7
x = -17/7/(-54/7)
x = 17/54
x = 17/54
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