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