42-12=12-4n

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Solution for 42-12=12-4n equation:


Simplifying
42 + -12 = 12 + -4n

Combine like terms: 42 + -12 = 30
30 = 12 + -4n

Solving
30 = 12 + -4n

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Add '4n' to each side of the equation.
30 + 4n = 12 + -4n + 4n

Combine like terms: -4n + 4n = 0
30 + 4n = 12 + 0
30 + 4n = 12

Add '-30' to each side of the equation.
30 + -30 + 4n = 12 + -30

Combine like terms: 30 + -30 = 0
0 + 4n = 12 + -30
4n = 12 + -30

Combine like terms: 12 + -30 = -18
4n = -18

Divide each side by '4'.
n = -4.5

Simplifying
n = -4.5

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