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(2/3)*(x-9)+1/3 = 7*x-15 // - 7*x-15
(2/3)*(x-9)-(7*x)+1/3+15 = 0
(2/3)*(x-9)-7*x+1/3+15 = 0
2/3*(x-9)-7*x+1/3+15 = 0
(2/3*3*(x-9))/3+(-7*3*x)/3+1/3+(3*15)/3 = 0
2/3*3*(x-9)-7*3*x+3*15+1 = 0
1-19*x-18+45 = 0
45-19*x-17 = 0
28-19*x = 0
(28-19*x)/3 = 0
(28-19*x)/3 = 0 // * 3
28-19*x = 0
28-19*x = 0 // - 28
-19*x = -28 // : -19
x = -28/(-19)
x = 28/19
x = 28/19
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