4y-15+4y-15=90

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Solution for 4y-15+4y-15=90 equation: 


Simplifying
4y + -15 + 4y + -15 = 90

Reorder the terms:
-15 + -15 + 4y + 4y = 90

Combine like terms: -15 + -15 = -30
-30 + 4y + 4y = 90

Combine like terms: 4y + 4y = 8y
-30 + 8y = 90

Solving
-30 + 8y = 90

Solving for variable 'y'.

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

Add '30' to each side of the equation.
-30 + 30 + 8y = 90 + 30

Combine like terms: -30 + 30 = 0
0 + 8y = 90 + 30
8y = 90 + 30

Combine like terms: 90 + 30 = 120
8y = 120

Divide each side by '8'.
y = 15

Simplifying
y = 15

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