8.2a-21=7.4a-15.4

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Solution for 8.2a-21=7.4a-15.4 equation:


Simplifying
8.2a + -21 = 7.4a + -15.4

Reorder the terms:
-21 + 8.2a = 7.4a + -15.4

Reorder the terms:
-21 + 8.2a = -15.4 + 7.4a

Solving
-21 + 8.2a = -15.4 + 7.4a

Solving for variable 'a'.

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

Add '-7.4a' to each side of the equation.
-21 + 8.2a + -7.4a = -15.4 + 7.4a + -7.4a

Combine like terms: 8.2a + -7.4a = 0.8a
-21 + 0.8a = -15.4 + 7.4a + -7.4a

Combine like terms: 7.4a + -7.4a = 0.0
-21 + 0.8a = -15.4 + 0.0
-21 + 0.8a = -15.4

Add '21' to each side of the equation.
-21 + 21 + 0.8a = -15.4 + 21

Combine like terms: -21 + 21 = 0
0 + 0.8a = -15.4 + 21
0.8a = -15.4 + 21

Combine like terms: -15.4 + 21 = 5.6
0.8a = 5.6

Divide each side by '0.8'.
a = 7

Simplifying
a = 7

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