7(1+3a)-7(a-5)=2a-6-4a

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Solution for 7(1+3a)-7(a-5)=2a-6-4a equation:


Simplifying
7(1 + 3a) + -7(a + -5) = 2a + -6 + -4a
(1 * 7 + 3a * 7) + -7(a + -5) = 2a + -6 + -4a
(7 + 21a) + -7(a + -5) = 2a + -6 + -4a

Reorder the terms:
7 + 21a + -7(-5 + a) = 2a + -6 + -4a
7 + 21a + (-5 * -7 + a * -7) = 2a + -6 + -4a
7 + 21a + (35 + -7a) = 2a + -6 + -4a

Reorder the terms:
7 + 35 + 21a + -7a = 2a + -6 + -4a

Combine like terms: 7 + 35 = 42
42 + 21a + -7a = 2a + -6 + -4a

Combine like terms: 21a + -7a = 14a
42 + 14a = 2a + -6 + -4a

Reorder the terms:
42 + 14a = -6 + 2a + -4a

Combine like terms: 2a + -4a = -2a
42 + 14a = -6 + -2a

Solving
42 + 14a = -6 + -2a

Solving for variable 'a'.

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

Add '2a' to each side of the equation.
42 + 14a + 2a = -6 + -2a + 2a

Combine like terms: 14a + 2a = 16a
42 + 16a = -6 + -2a + 2a

Combine like terms: -2a + 2a = 0
42 + 16a = -6 + 0
42 + 16a = -6

Add '-42' to each side of the equation.
42 + -42 + 16a = -6 + -42

Combine like terms: 42 + -42 = 0
0 + 16a = -6 + -42
16a = -6 + -42

Combine like terms: -6 + -42 = -48
16a = -48

Divide each side by '16'.
a = -3

Simplifying
a = -3

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