a-3(5a-4)=21

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


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

Reorder the terms:
a + -3(-4 + 5a) = 21
a + (-4 * -3 + 5a * -3) = 21
a + (12 + -15a) = 21

Reorder the terms:
12 + a + -15a = 21

Combine like terms: a + -15a = -14a
12 + -14a = 21

Solving
12 + -14a = 21

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 + -14a = 21 + -12

Combine like terms: 12 + -12 = 0
0 + -14a = 21 + -12
-14a = 21 + -12

Combine like terms: 21 + -12 = 9
-14a = 9

Divide each side by '-14'.
a = -0.6428571429

Simplifying
a = -0.6428571429

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