(8)+(1.15a)-(0.4a)=(-7)

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Solution for (8)+(1.15a)-(0.4a)=(-7) equation: 


Simplifying
(8) + (1.15a) + -1(0.4a) = (-7)
8 + (1.15a) + -1(0.4a) = (-7)

Remove parenthesis around (0.4a)
8 + (1.15a) + -1 * 0.4a = (-7)

Multiply -1 * 0.4
8 + (1.15a) + -0.4a = (-7)

Combine like terms: (1.15a) + -0.4a = 0.75a
8 + 0.75a = (-7)
8 + 0.75a = -7

Solving
8 + 0.75a = -7

Solving for variable 'a'.

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

Add '-8' to each side of the equation.
8 + -8 + 0.75a = -7 + -8

Combine like terms: 8 + -8 = 0
0 + 0.75a = -7 + -8
0.75a = -7 + -8

Combine like terms: -7 + -8 = -15
0.75a = -15

Divide each side by '0.75'.
a = -20

Simplifying
a = -20

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