What is the answer to -0.1+0.9a=2.15 ?

The answer to -0.1+0.9a=2.15 is a= 5/2

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-0.1+0.9a=2.15

- 0.1 + 0.9 a = 2.15

a = \frac{5}{2}

Decimal Notation

a = 2.5

Solution steps

- 0.1 + 0.9 a = 2.15

Multiply both sides by

100

- 10 + 90 a = 215

Move

10

to the right side

90 a = 225

Divide both sides by

90

a = \frac{5}{2}

4 x + 3 [x - 2 (2 x - 1)] = 4 - 3 x

\frac{8}{9} (\frac{1}{2} v - 18) + 2 v = \frac{2}{3} v

x, 2 x - 9 y = 18

7 - x = 3

4 (x - 9) - \frac{1}{2} (x - 9) = 21