-0.9(a+1)=0.1(a+9)

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Solution for -0.9(a+1)=0.1(a+9) equation:


Simplifying
-0.9(a + 1) = 0.1(a + 9)

Reorder the terms:
-0.9(1 + a) = 0.1(a + 9)
(1 * -0.9 + a * -0.9) = 0.1(a + 9)
(-0.9 + -0.9a) = 0.1(a + 9)

Reorder the terms:
-0.9 + -0.9a = 0.1(9 + a)
-0.9 + -0.9a = (9 * 0.1 + a * 0.1)
-0.9 + -0.9a = (0.9 + 0.1a)

Solving
-0.9 + -0.9a = 0.9 + 0.1a

Solving for variable 'a'.

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

Add '-0.1a' to each side of the equation.
-0.9 + -0.9a + -0.1a = 0.9 + 0.1a + -0.1a

Combine like terms: -0.9a + -0.1a = -1a
-0.9 + -1a = 0.9 + 0.1a + -0.1a

Combine like terms: 0.1a + -0.1a = 0.0
-0.9 + -1a = 0.9 + 0.0
-0.9 + -1a = 0.9

Add '0.9' to each side of the equation.
-0.9 + 0.9 + -1a = 0.9 + 0.9

Combine like terms: -0.9 + 0.9 = 0.0
0.0 + -1a = 0.9 + 0.9
-1a = 0.9 + 0.9

Combine like terms: 0.9 + 0.9 = 1.8
-1a = 1.8

Divide each side by '-1'.
a = -1.8

Simplifying
a = -1.8

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