2=y-(-20)

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Solution for 2=y-(-20) equation: 


Simplifying
2 = y + -1(-20)

Multiply -1 * -20
2 = y + 20

Reorder the terms:
2 = 20 + y

Solving
2 = 20 + y

Solving for variable 'y'.

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

Add '-1y' to each side of the equation.
2 + -1y = 20 + y + -1y

Combine like terms: y + -1y = 0
2 + -1y = 20 + 0
2 + -1y = 20

Add '-2' to each side of the equation.
2 + -2 + -1y = 20 + -2

Combine like terms: 2 + -2 = 0
0 + -1y = 20 + -2
-1y = 20 + -2

Combine like terms: 20 + -2 = 18
-1y = 18

Divide each side by '-1'.
y = -18

Simplifying
y = -18

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