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(-5/6)*(2*x+9) = 20 // - 20
(-5/6)*(2*x+9)-20 = 0
-5/6*(2*x+9)-20 = 0
-5/6*(2*x+9)-20 = 0
-5/3*x-55/2 = 0
-5/3*x-55/2 = 0
-5/3*x-55/2 = 0 // + 55/2
-5/3*x = 55/2 // : -5/3
x = 55/2/(-5/3)
x = -33/2
x = -33/2
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