7y-21=4y+3

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Solution for 7y-21=4y+3 equation:


Simplifying
7y + -21 = 4y + 3

Reorder the terms:
-21 + 7y = 4y + 3

Reorder the terms:
-21 + 7y = 3 + 4y

Solving
-21 + 7y = 3 + 4y

Solving for variable 'y'.

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

Add '-4y' to each side of the equation.
-21 + 7y + -4y = 3 + 4y + -4y

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

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

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

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

Combine like terms: 3 + 21 = 24
3y = 24

Divide each side by '3'.
y = 8

Simplifying
y = 8

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