3a+7(a-1)=19

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Solution for 3a+7(a-1)=19 equation:


Simplifying
3a + 7(a + -1) = 19

Reorder the terms:
3a + 7(-1 + a) = 19
3a + (-1 * 7 + a * 7) = 19
3a + (-7 + 7a) = 19

Reorder the terms:
-7 + 3a + 7a = 19

Combine like terms: 3a + 7a = 10a
-7 + 10a = 19

Solving
-7 + 10a = 19

Solving for variable 'a'.

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

Add '7' to each side of the equation.
-7 + 7 + 10a = 19 + 7

Combine like terms: -7 + 7 = 0
0 + 10a = 19 + 7
10a = 19 + 7

Combine like terms: 19 + 7 = 26
10a = 26

Divide each side by '10'.
a = 2.6

Simplifying
a = 2.6

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