7y-9=3y-15

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Solution for 7y-9=3y-15 equation:


Simplifying
7y + -9 = 3y + -15

Reorder the terms:
-9 + 7y = 3y + -15

Reorder the terms:
-9 + 7y = -15 + 3y

Solving
-9 + 7y = -15 + 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.
-9 + 7y + -3y = -15 + 3y + -3y

Combine like terms: 7y + -3y = 4y
-9 + 4y = -15 + 3y + -3y

Combine like terms: 3y + -3y = 0
-9 + 4y = -15 + 0
-9 + 4y = -15

Add '9' to each side of the equation.
-9 + 9 + 4y = -15 + 9

Combine like terms: -9 + 9 = 0
0 + 4y = -15 + 9
4y = -15 + 9

Combine like terms: -15 + 9 = -6
4y = -6

Divide each side by '4'.
y = -1.5

Simplifying
y = -1.5

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