128=5a+7(2a+4)+a

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Solution for 128=5a+7(2a+4)+a equation:


Simplifying
128 = 5a + 7(2a + 4) + a

Reorder the terms:
128 = 5a + 7(4 + 2a) + a
128 = 5a + (4 * 7 + 2a * 7) + a
128 = 5a + (28 + 14a) + a

Reorder the terms:
128 = 28 + 5a + 14a + a

Combine like terms: 5a + 14a = 19a
128 = 28 + 19a + a

Combine like terms: 19a + a = 20a
128 = 28 + 20a

Solving
128 = 28 + 20a

Solving for variable 'a'.

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

Add '-20a' to each side of the equation.
128 + -20a = 28 + 20a + -20a

Combine like terms: 20a + -20a = 0
128 + -20a = 28 + 0
128 + -20a = 28

Add '-128' to each side of the equation.
128 + -128 + -20a = 28 + -128

Combine like terms: 128 + -128 = 0
0 + -20a = 28 + -128
-20a = 28 + -128

Combine like terms: 28 + -128 = -100
-20a = -100

Divide each side by '-20'.
a = 5

Simplifying
a = 5

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