I need help what is 3-2y+(-8y)+7.8

Changes made to your input should not affect the solution:

(1): "7.8" was replaced by "(78/10)".

STEP
1
:

39
Simplify ——
5
Equation at the end of step
1
:

39
(3 - 10y) + ——
5
STEP
2
:
Rewriting the whole as an Equivalent Fraction

2.1 Adding a fraction to a whole

Rewrite the whole as a fraction using 5 as the denominator :

3 - 10y (3 - 10y) • 5
3 - 10y = ——————— = —————————————
1 5
Equivalent fraction : The fraction thus generated looks different but has the same value as the whole

Common denominator : The equivalent fraction and the other fraction involved in the calculation share the same denominator

Adding fractions that have a common denominator :

2.2 Adding up the two equivalent fractions
Add the two equivalent fractions which now have a common denominator

Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible:

(3-10y) • 5 + 39 54 - 50y
———————————————— = ————————
5 5
STEP
3
:

Pulling out like terms :

3.1 Pull out like factors :

54 - 50y = -2 • (25y - 27)

Final result :
-2 • (25y - 27)
———————————————
5

Yes you are correct