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(1/4)*(12*x-40) = (2/9)*(27*x+9) // - (2/9)*(27*x+9)
(1/4)*(12*x-40)-((2/9)*(27*x+9)) = 0
(1/4)*(12*x-40)+(-2/9)*(27*x+9) = 0
1/4*(12*x-40)-2/9*(27*x+9) = 0
1/4*(12*x-40)-2/9*(27*x+9) = 0
-3*x-12 = 0
-3*x-12 = 0
-3*x-12 = 0 // + 12
-3*x = 12 // : -3
x = 12/(-3)
x = -4
x = -4
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