4(a+3)+(-7)=6a+(-21)

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Solution for 4(a+3)+(-7)=6a+(-21) equation:


Simplifying
4(a + 3) + (-7) = 6a + (-21)

Reorder the terms:
4(3 + a) + (-7) = 6a + (-21)
(3 * 4 + a * 4) + (-7) = 6a + (-21)
(12 + 4a) + (-7) = 6a + (-21)
12 + 4a + -7 = 6a + (-21)

Reorder the terms:
12 + -7 + 4a = 6a + (-21)

Combine like terms: 12 + -7 = 5
5 + 4a = 6a + (-21)
5 + 4a = 6a + -21

Reorder the terms:
5 + 4a = -21 + 6a

Solving
5 + 4a = -21 + 6a

Solving for variable 'a'.

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

Add '-6a' to each side of the equation.
5 + 4a + -6a = -21 + 6a + -6a

Combine like terms: 4a + -6a = -2a
5 + -2a = -21 + 6a + -6a

Combine like terms: 6a + -6a = 0
5 + -2a = -21 + 0
5 + -2a = -21

Add '-5' to each side of the equation.
5 + -5 + -2a = -21 + -5

Combine like terms: 5 + -5 = 0
0 + -2a = -21 + -5
-2a = -21 + -5

Combine like terms: -21 + -5 = -26
-2a = -26

Divide each side by '-2'.
a = 13

Simplifying
a = 13

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