3(1/2x+21) - solution

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Solution for 3(1/2x+21) equation:

x in (-oo:+oo)

3*((1/2)*x+21) = 0

3*(1/2*x+21) = 0

1/2*x+21 = 0 // - 21

1/2*x = -21 // : 1/2

x = -21/1/2

x = -42

x = -42

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