130=.5(20)(a+7)

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Solution for 130=.5(20)(a+7) equation:


Simplifying
130 = 0.5(20)(a + 7)

Reorder the terms:
130 = 0.5 * 20(7 + a)

Multiply 0.5 * 20
130 = 10(7 + a)
130 = (7 * 10 + a * 10)
130 = (70 + 10a)

Solving
130 = 70 + 10a

Solving for variable 'a'.

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

Add '-10a' to each side of the equation.
130 + -10a = 70 + 10a + -10a

Combine like terms: 10a + -10a = 0
130 + -10a = 70 + 0
130 + -10a = 70

Add '-130' to each side of the equation.
130 + -130 + -10a = 70 + -130

Combine like terms: 130 + -130 = 0
0 + -10a = 70 + -130
-10a = 70 + -130

Combine like terms: 70 + -130 = -60
-10a = -60

Divide each side by '-10'.
a = 6

Simplifying
a = 6

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