7-21a=15-25a

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Solution for 7-21a=15-25a equation:


Simplifying
7 + -21a = 15 + -25a

Solving
7 + -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.
7 + -21a + 25a = 15 + -25a + 25a

Combine like terms: -21a + 25a = 4a
7 + 4a = 15 + -25a + 25a

Combine like terms: -25a + 25a = 0
7 + 4a = 15 + 0
7 + 4a = 15

Add '-7' to each side of the equation.
7 + -7 + 4a = 15 + -7

Combine like terms: 7 + -7 = 0
0 + 4a = 15 + -7
4a = 15 + -7

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

Divide each side by '4'.
a = 2

Simplifying
a = 2

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