21y=18(y+7)

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Solution for 21y=18(y+7) equation:


Simplifying
21y = 18(y + 7)

Reorder the terms:
21y = 18(7 + y)
21y = (7 * 18 + y * 18)
21y = (126 + 18y)

Solving
21y = 126 + 18y

Solving for variable 'y'.

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

Add '-18y' to each side of the equation.
21y + -18y = 126 + 18y + -18y

Combine like terms: 21y + -18y = 3y
3y = 126 + 18y + -18y

Combine like terms: 18y + -18y = 0
3y = 126 + 0
3y = 126

Divide each side by '3'.
y = 42

Simplifying
y = 42

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