3*7+y=-8

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Solution for 3*7+y=-8 equation: 


Simplifying
3 * 7 + y = -8

Multiply 3 * 7
21 + y = -8

Solving
21 + y = -8

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 + y = -8 + -21

Combine like terms: 21 + -21 = 0
0 + y = -8 + -21
y = -8 + -21

Combine like terms: -8 + -21 = -29
y = -29

Simplifying
y = -29

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