7+2y-4=7y+21-3y

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Solution for 7+2y-4=7y+21-3y equation:


Simplifying
7 + 2y + -4 = 7y + 21 + -3y

Reorder the terms:
7 + -4 + 2y = 7y + 21 + -3y

Combine like terms: 7 + -4 = 3
3 + 2y = 7y + 21 + -3y

Reorder the terms:
3 + 2y = 21 + 7y + -3y

Combine like terms: 7y + -3y = 4y
3 + 2y = 21 + 4y

Solving
3 + 2y = 21 + 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.
3 + 2y + -4y = 21 + 4y + -4y

Combine like terms: 2y + -4y = -2y
3 + -2y = 21 + 4y + -4y

Combine like terms: 4y + -4y = 0
3 + -2y = 21 + 0
3 + -2y = 21

Add '-3' to each side of the equation.
3 + -3 + -2y = 21 + -3

Combine like terms: 3 + -3 = 0
0 + -2y = 21 + -3
-2y = 21 + -3

Combine like terms: 21 + -3 = 18
-2y = 18

Divide each side by '-2'.
y = -9

Simplifying
y = -9

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