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

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Solution for 7a+3a=-(1-7a)-(7-5a) equation:


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

Combine like terms: 7a + 3a = 10a
10a = -1(1 + -7a) + -1(7 + -5a)
10a = (1 * -1 + -7a * -1) + -1(7 + -5a)
10a = (-1 + 7a) + -1(7 + -5a)
10a = -1 + 7a + (7 * -1 + -5a * -1)
10a = -1 + 7a + (-7 + 5a)

Reorder the terms:
10a = -1 + -7 + 7a + 5a

Combine like terms: -1 + -7 = -8
10a = -8 + 7a + 5a

Combine like terms: 7a + 5a = 12a
10a = -8 + 12a

Solving
10a = -8 + 12a

Solving for variable 'a'.

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

Add '-12a' to each side of the equation.
10a + -12a = -8 + 12a + -12a

Combine like terms: 10a + -12a = -2a
-2a = -8 + 12a + -12a

Combine like terms: 12a + -12a = 0
-2a = -8 + 0
-2a = -8

Divide each side by '-2'.
a = 4

Simplifying
a = 4

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