-21+8=y-9

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Solution for -21+8=y-9 equation:


Simplifying
-21 + 8 = y + -9

Combine like terms: -21 + 8 = -13
-13 = y + -9

Reorder the terms:
-13 = -9 + y

Solving
-13 = -9 + 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.
-13 + -1y = -9 + y + -1y

Combine like terms: y + -1y = 0
-13 + -1y = -9 + 0
-13 + -1y = -9

Add '13' to each side of the equation.
-13 + 13 + -1y = -9 + 13

Combine like terms: -13 + 13 = 0
0 + -1y = -9 + 13
-1y = -9 + 13

Combine like terms: -9 + 13 = 4
-1y = 4

Divide each side by '-1'.
y = -4

Simplifying
y = -4

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