10y-15=9y-9

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Solution for 10y-15=9y-9 equation:


Simplifying
10y + -15 = 9y + -9

Reorder the terms:
-15 + 10y = 9y + -9

Reorder the terms:
-15 + 10y = -9 + 9y

Solving
-15 + 10y = -9 + 9y

Solving for variable 'y'.

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

Add '-9y' to each side of the equation.
-15 + 10y + -9y = -9 + 9y + -9y

Combine like terms: 10y + -9y = 1y
-15 + 1y = -9 + 9y + -9y

Combine like terms: 9y + -9y = 0
-15 + 1y = -9 + 0
-15 + 1y = -9

Add '15' to each side of the equation.
-15 + 15 + 1y = -9 + 15

Combine like terms: -15 + 15 = 0
0 + 1y = -9 + 15
1y = -9 + 15

Combine like terms: -9 + 15 = 6
1y = 6

Divide each side by '1'.
y = 6

Simplifying
y = 6

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