77=7(3a-1)

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Solution for 77=7(3a-1) equation:


Simplifying
77 = 7(3a + -1)

Reorder the terms:
77 = 7(-1 + 3a)
77 = (-1 * 7 + 3a * 7)
77 = (-7 + 21a)

Solving
77 = -7 + 21a

Solving for variable 'a'.

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

Add '-21a' to each side of the equation.
77 + -21a = -7 + 21a + -21a

Combine like terms: 21a + -21a = 0
77 + -21a = -7 + 0
77 + -21a = -7

Add '-77' to each side of the equation.
77 + -77 + -21a = -7 + -77

Combine like terms: 77 + -77 = 0
0 + -21a = -7 + -77
-21a = -7 + -77

Combine like terms: -7 + -77 = -84
-21a = -84

Divide each side by '-21'.
a = 4

Simplifying
a = 4

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