7y-15=3(y+7)

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Solution for 7y-15=3(y+7) equation:


Simplifying
7y + -15 = 3(y + 7)

Reorder the terms:
-15 + 7y = 3(y + 7)

Reorder the terms:
-15 + 7y = 3(7 + y)
-15 + 7y = (7 * 3 + y * 3)
-15 + 7y = (21 + 3y)

Solving
-15 + 7y = 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.
-15 + 7y + -3y = 21 + 3y + -3y

Combine like terms: 7y + -3y = 4y
-15 + 4y = 21 + 3y + -3y

Combine like terms: 3y + -3y = 0
-15 + 4y = 21 + 0
-15 + 4y = 21

Add '15' to each side of the equation.
-15 + 15 + 4y = 21 + 15

Combine like terms: -15 + 15 = 0
0 + 4y = 21 + 15
4y = 21 + 15

Combine like terms: 21 + 15 = 36
4y = 36

Divide each side by '4'.
y = 9

Simplifying
y = 9

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