3(5y-7)=9

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Solution for 3(5y-7)=9 equation: 


Simplifying
3(5y + -7) = 9

Reorder the terms:
3(-7 + 5y) = 9
(-7 * 3 + 5y * 3) = 9
(-21 + 15y) = 9

Solving
-21 + 15y = 9

Solving for variable 'y'.

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

Add '21' to each side of the equation.
-21 + 21 + 15y = 9 + 21

Combine like terms: -21 + 21 = 0
0 + 15y = 9 + 21
15y = 9 + 21

Combine like terms: 9 + 21 = 30
15y = 30

Divide each side by '15'.
y = 2

Simplifying
y = 2

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