y+3=2x-21

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Solution for y+3=2x-21 equation: 


Simplifying
y + 3 = 2x + -21

Reorder the terms:
3 + y = 2x + -21

Reorder the terms:
3 + y = -21 + 2x

Solving
3 + y = -21 + 2x

Solving for variable 'y'.

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

Add '-3' to each side of the equation.
3 + -3 + y = -21 + -3 + 2x

Combine like terms: 3 + -3 = 0
0 + y = -21 + -3 + 2x
y = -21 + -3 + 2x

Combine like terms: -21 + -3 = -24
y = -24 + 2x

Simplifying
y = -24 + 2x

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