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(1/3)*(x-7) = 4 // - 4
(1/3)*(x-7)-4 = 0
1/3*(x-7)-4 = 0
1/3*(x-7)-4 = 0
1/3*x-19/3 = 0
1/3*x-19/3 = 0
1/3*x-19/3 = 0 // + 19/3
1/3*x = 19/3 // : 1/3
x = 19/3/1/3
x = 19
x = 19
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