100=(.5)(160)+a

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Solution for 100=(.5)(160)+a equation:


Simplifying
100 = (0.5)(160) + a

Multiply 0.5 * 160
100 = 80 + a

Solving
100 = 80 + a

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.
100 + -1a = 80 + a + -1a

Combine like terms: a + -1a = 0
100 + -1a = 80 + 0
100 + -1a = 80

Add '-100' to each side of the equation.
100 + -100 + -1a = 80 + -100

Combine like terms: 100 + -100 = 0
0 + -1a = 80 + -100
-1a = 80 + -100

Combine like terms: 80 + -100 = -20
-1a = -20

Divide each side by '-1'.
a = 20

Simplifying
a = 20

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