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(1/3)*(3*x+6)-3*x = -10 // + 10
(1/3)*(3*x+6)-3*x+10 = 0
1/3*(3*x+6)-3*x+10 = 0
1/3*(3*x+6)-3*x+10 = 0
2-2*x+10 = 0
12-2*x = 0
12-2*x = 0
12-2*x = 0 // - 12
-2*x = -12 // : -2
x = -12/(-2)
x = 6
x = 6
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