87+42+3y=180

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Solution for 87+42+3y=180 equation: 


Simplifying
87 + 42 + 3y = 180

Combine like terms: 87 + 42 = 129
129 + 3y = 180

Solving
129 + 3y = 180

Solving for variable 'y'.

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

Add '-129' to each side of the equation.
129 + -129 + 3y = 180 + -129

Combine like terms: 129 + -129 = 0
0 + 3y = 180 + -129
3y = 180 + -129

Combine like terms: 180 + -129 = 51
3y = 51

Divide each side by '3'.
y = 17

Simplifying
y = 17

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