100=5(6-7a)

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Solution for 100=5(6-7a) equation:


Simplifying
100 = 5(6 + -7a)
100 = (6 * 5 + -7a * 5)
100 = (30 + -35a)

Solving
100 = 30 + -35a

Solving for variable 'a'.

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

Add '35a' to each side of the equation.
100 + 35a = 30 + -35a + 35a

Combine like terms: -35a + 35a = 0
100 + 35a = 30 + 0
100 + 35a = 30

Add '-100' to each side of the equation.
100 + -100 + 35a = 30 + -100

Combine like terms: 100 + -100 = 0
0 + 35a = 30 + -100
35a = 30 + -100

Combine like terms: 30 + -100 = -70
35a = -70

Divide each side by '35'.
a = -2

Simplifying
a = -2

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