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

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


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

Reorder the terms:
5a + -4(7 + 3a) = -21
5a + (7 * -4 + 3a * -4) = -21
5a + (-28 + -12a) = -21

Reorder the terms:
-28 + 5a + -12a = -21

Combine like terms: 5a + -12a = -7a
-28 + -7a = -21

Solving
-28 + -7a = -21

Solving for variable 'a'.

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

Add '28' to each side of the equation.
-28 + 28 + -7a = -21 + 28

Combine like terms: -28 + 28 = 0
0 + -7a = -21 + 28
-7a = -21 + 28

Combine like terms: -21 + 28 = 7
-7a = 7

Divide each side by '-7'.
a = -1

Simplifying
a = -1

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