7+9(.1-8a)=-25

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Solution for 7+9(.1-8a)=-25 equation:


Simplifying
7 + 9(0.1 + -8a) = -25
7 + (0.1 * 9 + -8a * 9) = -25
7 + (0.9 + -72a) = -25

Combine like terms: 7 + 0.9 = 7.9
7.9 + -72a = -25

Solving
7.9 + -72a = -25

Solving for variable 'a'.

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

Add '-7.9' to each side of the equation.
7.9 + -7.9 + -72a = -25 + -7.9

Combine like terms: 7.9 + -7.9 = 0.0
0.0 + -72a = -25 + -7.9
-72a = -25 + -7.9

Combine like terms: -25 + -7.9 = -32.9
-72a = -32.9

Divide each side by '-72'.
a = 0.4569444444

Simplifying
a = 0.4569444444

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