Question

13-3d=-8

Answer 1

d=7

Answer 2

Explain steps

Answer 3

13 - 3d = -8
-13 -13
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-3d = -21
--- ----
-3 -3


d = 7

Answer 4

Basically you have to solve for d by doing the inverse of the operations in the equation

Answer 5

subtract 13 from 13 and -8
-3d=-21
divide -3 and -21
d=-21

Answer 6

you want to move your expression to one side, and your constants to the other

we have
13-3d=-8

we want the expression to be positive so we will move it to the right side

to do this we must do the opposite to what we have
we have -3d
so you must +3d
if you add to the left you must add to the right so it becomes

13-3d=-8

13-3d+3d=-8+3d

the -3d+3d becomes 0

13-0=-8+3d

13=-8+3d

now we want our constants on the left side we have -8 on the right, so we must +8

13+8=-8+8+3d

21=0+3d

21=3d

we have 3d, we want 1d
since we have 3 lots of d, we want to divide by 3
since divide is opposite to multiply

so we get

21/3=3d/3

the 3/3 =1

21/3=1d
21/3=7

7=1d

d=7