7y-4=2y+21

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Solution for 7y-4=2y+21 equation:


Simplifying
7y + -4 = 2y + 21

Reorder the terms:
-4 + 7y = 2y + 21

Reorder the terms:
-4 + 7y = 21 + 2y

Solving
-4 + 7y = 21 + 2y

Solving for variable 'y'.

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

Add '-2y' to each side of the equation.
-4 + 7y + -2y = 21 + 2y + -2y

Combine like terms: 7y + -2y = 5y
-4 + 5y = 21 + 2y + -2y

Combine like terms: 2y + -2y = 0
-4 + 5y = 21 + 0
-4 + 5y = 21

Add '4' to each side of the equation.
-4 + 4 + 5y = 21 + 4

Combine like terms: -4 + 4 = 0
0 + 5y = 21 + 4
5y = 21 + 4

Combine like terms: 21 + 4 = 25
5y = 25

Divide each side by '5'.
y = 5

Simplifying
y = 5

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