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3*x-(4*((10/3)*x+10)) = -12 // + 12
3*x-(4*((10/3)*x+10))+12 = 0
3*x-4*((10/3)*x+10)+12 = 0
3*x-4*(10/3*x+10)+12 = 0
3*x-4*(10/3*x+10)+12 = 0
12-31/3*x-40 = 0
-31/3*x-28 = 0
-31/3*x-28 = 0
-31/3*x-28 = 0 // + 28
-31/3*x = 28 // : -31/3
x = 28/(-31/3)
x = -84/31
x = -84/31
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