8-21a=15-25a

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Solution for 8-21a=15-25a equation:


Simplifying
8 + -21a = 15 + -25a

Solving
8 + -21a = 15 + -25a

Solving for variable 'a'.

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

Add '25a' to each side of the equation.
8 + -21a + 25a = 15 + -25a + 25a

Combine like terms: -21a + 25a = 4a
8 + 4a = 15 + -25a + 25a

Combine like terms: -25a + 25a = 0
8 + 4a = 15 + 0
8 + 4a = 15

Add '-8' to each side of the equation.
8 + -8 + 4a = 15 + -8

Combine like terms: 8 + -8 = 0
0 + 4a = 15 + -8
4a = 15 + -8

Combine like terms: 15 + -8 = 7
4a = 7

Divide each side by '4'.
a = 1.75

Simplifying
a = 1.75

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