6+7(2-4a)=13

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Solution for 6+7(2-4a)=13 equation: 


Simplifying
6 + 7(2 + -4a) = 13
6 + (2 * 7 + -4a * 7) = 13
6 + (14 + -28a) = 13

Combine like terms: 6 + 14 = 20
20 + -28a = 13

Solving
20 + -28a = 13

Solving for variable 'a'.

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

Add '-20' to each side of the equation.
20 + -20 + -28a = 13 + -20

Combine like terms: 20 + -20 = 0
0 + -28a = 13 + -20
-28a = 13 + -20

Combine like terms: 13 + -20 = -7
-28a = -7

Divide each side by '-28'.
a = 0.25

Simplifying
a = 0.25

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