42=3(y+7)

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Solution for 42=3(y+7) equation:


Simplifying
42 = 3(y + 7)

Reorder the terms:
42 = 3(7 + y)
42 = (7 * 3 + y * 3)
42 = (21 + 3y)

Solving
42 = 21 + 3y

Solving for variable 'y'.

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

Add '-3y' to each side of the equation.
42 + -3y = 21 + 3y + -3y

Combine like terms: 3y + -3y = 0
42 + -3y = 21 + 0
42 + -3y = 21

Add '-42' to each side of the equation.
42 + -42 + -3y = 21 + -42

Combine like terms: 42 + -42 = 0
0 + -3y = 21 + -42
-3y = 21 + -42

Combine like terms: 21 + -42 = -21
-3y = -21

Divide each side by '-3'.
y = 7

Simplifying
y = 7

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