7=(5+a)*4

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Solution for 7=(5+a)*4 equation:


Simplifying
7 = (5 + a) * 4

Reorder the terms for easier multiplication:
7 = 4(5 + a)
7 = (5 * 4 + a * 4)
7 = (20 + 4a)

Solving
7 = 20 + 4a

Solving for variable 'a'.

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

Add '-4a' to each side of the equation.
7 + -4a = 20 + 4a + -4a

Combine like terms: 4a + -4a = 0
7 + -4a = 20 + 0
7 + -4a = 20

Add '-7' to each side of the equation.
7 + -7 + -4a = 20 + -7

Combine like terms: 7 + -7 = 0
0 + -4a = 20 + -7
-4a = 20 + -7

Combine like terms: 20 + -7 = 13
-4a = 13

Divide each side by '-4'.
a = -3.25

Simplifying
a = -3.25

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