=3(7+y)

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Solution for =3(7+y) equation: 


Simplifying
0 = 3(7 + y)
0 = (7 * 3 + y * 3)
0 = (21 + 3y)

Solving
0 = 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.
0 + -3y = 21 + 3y + -3y
Remove the zero:
-3y = 21 + 3y + -3y

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

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

Simplifying
y = -7

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