3(a+3)=7(a-1)

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Solution for 3(a+3)=7(a-1) equation:


Simplifying
3(a + 3) = 7(a + -1)

Reorder the terms:
3(3 + a) = 7(a + -1)
(3 * 3 + a * 3) = 7(a + -1)
(9 + 3a) = 7(a + -1)

Reorder the terms:
9 + 3a = 7(-1 + a)
9 + 3a = (-1 * 7 + a * 7)
9 + 3a = (-7 + 7a)

Solving
9 + 3a = -7 + 7a

Solving for variable 'a'.

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

Add '-7a' to each side of the equation.
9 + 3a + -7a = -7 + 7a + -7a

Combine like terms: 3a + -7a = -4a
9 + -4a = -7 + 7a + -7a

Combine like terms: 7a + -7a = 0
9 + -4a = -7 + 0
9 + -4a = -7

Add '-9' to each side of the equation.
9 + -9 + -4a = -7 + -9

Combine like terms: 9 + -9 = 0
0 + -4a = -7 + -9
-4a = -7 + -9

Combine like terms: -7 + -9 = -16
-4a = -16

Divide each side by '-4'.
a = 4

Simplifying
a = 4

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