3(a-1)+5(a+3)=20

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Solution for 3(a-1)+5(a+3)=20 equation:


Simplifying
3(a + -1) + 5(a + 3) = 20

Reorder the terms:
3(-1 + a) + 5(a + 3) = 20
(-1 * 3 + a * 3) + 5(a + 3) = 20
(-3 + 3a) + 5(a + 3) = 20

Reorder the terms:
-3 + 3a + 5(3 + a) = 20
-3 + 3a + (3 * 5 + a * 5) = 20
-3 + 3a + (15 + 5a) = 20

Reorder the terms:
-3 + 15 + 3a + 5a = 20

Combine like terms: -3 + 15 = 12
12 + 3a + 5a = 20

Combine like terms: 3a + 5a = 8a
12 + 8a = 20

Solving
12 + 8a = 20

Solving for variable 'a'.

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

Add '-12' to each side of the equation.
12 + -12 + 8a = 20 + -12

Combine like terms: 12 + -12 = 0
0 + 8a = 20 + -12
8a = 20 + -12

Combine like terms: 20 + -12 = 8
8a = 8

Divide each side by '8'.
a = 1

Simplifying
a = 1

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