x+9=42-2x - solution

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Solution for x+9=42-2x equation:

x in (-oo:+oo)

x+9 = 42-(2*x) // - 42-(2*x)

x+2*x-42+9 = 0

3*x-33 = 0 // + 33

3*x = 33 // : 3

x = 33/3

x = 11

x = 11

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