120=0.7a-45+21

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


Simplifying
120 = 0.7a + -45 + 21

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

Combine like terms: -45 + 21 = -24
120 = -24 + 0.7a

Solving
120 = -24 + 0.7a

Solving for variable 'a'.

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

Add '-0.7a' to each side of the equation.
120 + -0.7a = -24 + 0.7a + -0.7a

Combine like terms: 0.7a + -0.7a = 0.0
120 + -0.7a = -24 + 0.0
120 + -0.7a = -24

Add '-120' to each side of the equation.
120 + -120 + -0.7a = -24 + -120

Combine like terms: 120 + -120 = 0
0 + -0.7a = -24 + -120
-0.7a = -24 + -120

Combine like terms: -24 + -120 = -144
-0.7a = -144

Divide each side by '-0.7'.
a = 205.7142857

Simplifying
a = 205.7142857

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