120=0.6(220-a)

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Solution for 120=0.6(220-a) equation:


Simplifying
120 = 0.6(220 + -1a)
120 = (220 * 0.6 + -1a * 0.6)
120 = (132 + -0.6a)

Solving
120 = 132 + -0.6a

Solving for variable 'a'.

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

Add '0.6a' to each side of the equation.
120 + 0.6a = 132 + -0.6a + 0.6a

Combine like terms: -0.6a + 0.6a = 0.0
120 + 0.6a = 132 + 0.0
120 + 0.6a = 132

Add '-120' to each side of the equation.
120 + -120 + 0.6a = 132 + -120

Combine like terms: 120 + -120 = 0
0 + 0.6a = 132 + -120
0.6a = 132 + -120

Combine like terms: 132 + -120 = 12
0.6a = 12

Divide each side by '0.6'.
a = 20

Simplifying
a = 20

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