5(a+7)-4(a-1)=20

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Solution for 5(a+7)-4(a-1)=20 equation:


Simplifying
5(a + 7) + -4(a + -1) = 20

Reorder the terms:
5(7 + a) + -4(a + -1) = 20
(7 * 5 + a * 5) + -4(a + -1) = 20
(35 + 5a) + -4(a + -1) = 20

Reorder the terms:
35 + 5a + -4(-1 + a) = 20
35 + 5a + (-1 * -4 + a * -4) = 20
35 + 5a + (4 + -4a) = 20

Reorder the terms:
35 + 4 + 5a + -4a = 20

Combine like terms: 35 + 4 = 39
39 + 5a + -4a = 20

Combine like terms: 5a + -4a = 1a
39 + 1a = 20

Solving
39 + 1a = 20

Solving for variable 'a'.

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

Add '-39' to each side of the equation.
39 + -39 + 1a = 20 + -39

Combine like terms: 39 + -39 = 0
0 + 1a = 20 + -39
1a = 20 + -39

Combine like terms: 20 + -39 = -19
1a = -19

Divide each side by '1'.
a = -19

Simplifying
a = -19

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