3(a+7)-(5+a)=7a-3a

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Solution for 3(a+7)-(5+a)=7a-3a equation:


Simplifying
3(a + 7) + -1(5 + a) = 7a + -3a

Reorder the terms:
3(7 + a) + -1(5 + a) = 7a + -3a
(7 * 3 + a * 3) + -1(5 + a) = 7a + -3a
(21 + 3a) + -1(5 + a) = 7a + -3a
21 + 3a + (5 * -1 + a * -1) = 7a + -3a
21 + 3a + (-5 + -1a) = 7a + -3a

Reorder the terms:
21 + -5 + 3a + -1a = 7a + -3a

Combine like terms: 21 + -5 = 16
16 + 3a + -1a = 7a + -3a

Combine like terms: 3a + -1a = 2a
16 + 2a = 7a + -3a

Combine like terms: 7a + -3a = 4a
16 + 2a = 4a

Solving
16 + 2a = 4a

Solving for variable 'a'.

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

Add '-4a' to each side of the equation.
16 + 2a + -4a = 4a + -4a

Combine like terms: 2a + -4a = -2a
16 + -2a = 4a + -4a

Combine like terms: 4a + -4a = 0
16 + -2a = 0

Add '-16' to each side of the equation.
16 + -16 + -2a = 0 + -16

Combine like terms: 16 + -16 = 0
0 + -2a = 0 + -16
-2a = 0 + -16

Combine like terms: 0 + -16 = -16
-2a = -16

Divide each side by '-2'.
a = 8

Simplifying
a = 8

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