7-a=-3(a-7)

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Solution for 7-a=-3(a-7) equation:


Simplifying
7 + -1a = -3(a + -7)

Reorder the terms:
7 + -1a = -3(-7 + a)
7 + -1a = (-7 * -3 + a * -3)
7 + -1a = (21 + -3a)

Solving
7 + -1a = 21 + -3a

Solving for variable 'a'.

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

Add '3a' to each side of the equation.
7 + -1a + 3a = 21 + -3a + 3a

Combine like terms: -1a + 3a = 2a
7 + 2a = 21 + -3a + 3a

Combine like terms: -3a + 3a = 0
7 + 2a = 21 + 0
7 + 2a = 21

Add '-7' to each side of the equation.
7 + -7 + 2a = 21 + -7

Combine like terms: 7 + -7 = 0
0 + 2a = 21 + -7
2a = 21 + -7

Combine like terms: 21 + -7 = 14
2a = 14

Divide each side by '2'.
a = 7

Simplifying
a = 7

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