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x in (-oo:+oo)
(1/3)*(6*x+3) = 19 // - 19
(1/3)*(6*x+3)-19 = 0
1/3*(6*x+3)-19 = 0
1/3*(6*x+3)-19 = 0
2*x-18 = 0
2*x-18 = 0
2*x-18 = 0 // + 18
2*x = 18 // : 2
x = 18/2
x = 9
x = 9
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