89=A+(30-X)

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Solution for 89=A+(30-X) equation:


Simplifying
89 = A + (30 + -1X)

Remove parenthesis around (30 + -1X)
89 = A + 30 + -1X

Reorder the terms:
89 = 30 + A + -1X

Solving
89 = 30 + A + -1X

Solving for variable 'A'.

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

Add '-1A' to each side of the equation.
89 + -1A = 30 + A + -1A + -1X

Combine like terms: A + -1A = 0
89 + -1A = 30 + 0 + -1X
89 + -1A = 30 + -1X

Add '-89' to each side of the equation.
89 + -89 + -1A = 30 + -89 + -1X

Combine like terms: 89 + -89 = 0
0 + -1A = 30 + -89 + -1X
-1A = 30 + -89 + -1X

Combine like terms: 30 + -89 = -59
-1A = -59 + -1X

Divide each side by '-1'.
A = 59 + X

Simplifying
A = 59 + X

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