y+2=7x+21

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Solution for y+2=7x+21 equation: 


Simplifying
y + 2 = 7x + 21

Reorder the terms:
2 + y = 7x + 21

Reorder the terms:
2 + y = 21 + 7x

Solving
2 + y = 21 + 7x

Solving for variable 'y'.

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

Add '-2' to each side of the equation.
2 + -2 + y = 21 + -2 + 7x

Combine like terms: 2 + -2 = 0
0 + y = 21 + -2 + 7x
y = 21 + -2 + 7x

Combine like terms: 21 + -2 = 19
y = 19 + 7x

Simplifying
y = 19 + 7x

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