6.4-y=625

A mixed number is an addition of its whole and fractional parts.

6.4-y=6+25

Add 6 and 25.

To write 6 as a fraction with a common denominator, multiply by 55.

6.4-y=6⋅55+25

Combine 6 and 55.

6.4-y=6⋅55+25

Combine the numerators over the common denominator.

6.4-y=6⋅5+25

Simplify the numerator.

Multiply 6 by 5.

6.4-y=30+25

Add 30 and 2.

6.4-y=325

6.4-y=325

6.4-y=325

6.4-y=325

Subtract 6.4 from both sides of the equation.

-y=325-6.4

To write -6.4 as a fraction with a common denominator, multiply by 55.

-y=325-6.4⋅55

Combine -6.4 and 55.

-y=325+-6.4⋅55

Combine the numerators over the common denominator.

-y=32-6.4⋅55

Simplify the numerator.

Multiply -6.4 by 5.

-y=32-325

Subtract 32 from 32.

-y=05

-y=05

Divide 0 by 5.

-y=0

-y=0

Multiply each term in -y=0 by -1.

(-y)⋅-1=0⋅-1

Multiply (-y)⋅-1.

Multiply -1 by -1.

1y=0⋅-1

Multiply y by 1.

y=0⋅-1

y=0⋅-1

Multiply 0 by -1.

y=0

y=0

Solve for y 6.4-y=6 2/5