42=18-6y

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Solution for 42=18-6y equation:


Simplifying
42 = 18 + -6y

Solving
42 = 18 + -6y

Solving for variable 'y'.

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

Add '6y' to each side of the equation.
42 + 6y = 18 + -6y + 6y

Combine like terms: -6y + 6y = 0
42 + 6y = 18 + 0
42 + 6y = 18

Add '-42' to each side of the equation.
42 + -42 + 6y = 18 + -42

Combine like terms: 42 + -42 = 0
0 + 6y = 18 + -42
6y = 18 + -42

Combine like terms: 18 + -42 = -24
6y = -24

Divide each side by '6'.
y = -4

Simplifying
y = -4

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