(90-a)+(180-a)=200

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Solution for (90-a)+(180-a)=200 equation:


Simplifying
(90 + -1a) + (180 + -1a) = 200

Remove parenthesis around (90 + -1a)
90 + -1a + (180 + -1a) = 200

Remove parenthesis around (180 + -1a)
90 + -1a + 180 + -1a = 200

Reorder the terms:
90 + 180 + -1a + -1a = 200

Combine like terms: 90 + 180 = 270
270 + -1a + -1a = 200

Combine like terms: -1a + -1a = -2a
270 + -2a = 200

Solving
270 + -2a = 200

Solving for variable 'a'.

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

Add '-270' to each side of the equation.
270 + -270 + -2a = 200 + -270

Combine like terms: 270 + -270 = 0
0 + -2a = 200 + -270
-2a = 200 + -270

Combine like terms: 200 + -270 = -70
-2a = -70

Divide each side by '-2'.
a = 35

Simplifying
a = 35

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