3a-21=4a+7(a+5)

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Solution for 3a-21=4a+7(a+5) equation:


Simplifying
3a + -21 = 4a + 7(a + 5)

Reorder the terms:
-21 + 3a = 4a + 7(a + 5)

Reorder the terms:
-21 + 3a = 4a + 7(5 + a)
-21 + 3a = 4a + (5 * 7 + a * 7)
-21 + 3a = 4a + (35 + 7a)

Reorder the terms:
-21 + 3a = 35 + 4a + 7a

Combine like terms: 4a + 7a = 11a
-21 + 3a = 35 + 11a

Solving
-21 + 3a = 35 + 11a

Solving for variable 'a'.

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

Add '-11a' to each side of the equation.
-21 + 3a + -11a = 35 + 11a + -11a

Combine like terms: 3a + -11a = -8a
-21 + -8a = 35 + 11a + -11a

Combine like terms: 11a + -11a = 0
-21 + -8a = 35 + 0
-21 + -8a = 35

Add '21' to each side of the equation.
-21 + 21 + -8a = 35 + 21

Combine like terms: -21 + 21 = 0
0 + -8a = 35 + 21
-8a = 35 + 21

Combine like terms: 35 + 21 = 56
-8a = 56

Divide each side by '-8'.
a = -7

Simplifying
a = -7

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