120=45a+0.7-21

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Solution for 120=45a+0.7-21 equation:


Simplifying
120 = 45a + 0.7 + -21

Reorder the terms:
120 = 0.7 + -21 + 45a

Combine like terms: 0.7 + -21 = -20.3
120 = -20.3 + 45a

Solving
120 = -20.3 + 45a

Solving for variable 'a'.

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

Add '-45a' to each side of the equation.
120 + -45a = -20.3 + 45a + -45a

Combine like terms: 45a + -45a = 0
120 + -45a = -20.3 + 0
120 + -45a = -20.3

Add '-120' to each side of the equation.
120 + -120 + -45a = -20.3 + -120

Combine like terms: 120 + -120 = 0
0 + -45a = -20.3 + -120
-45a = -20.3 + -120

Combine like terms: -20.3 + -120 = -140.3
-45a = -140.3

Divide each side by '-45'.
a = 3.117777778

Simplifying
a = 3.117777778

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