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Nitella [24]
3 years ago
9

Help me solve this equation 3x-7=4x

Mathematics
2 answers:
Alla [95]3 years ago
7 0
3x - 7 = 4x

We're basically just trying to take all of the variables & put it onto one side, and then move everything else to the other side :)

So, we must add 7 to both sides.

3x = 4x + 7

Then, we subtract 4x from both sides.

3x - 4x = 7

Simplify.

-x = 7

Divide both sides by -1.

x = -7

To check our work, we simply need to plug in -7 for x in our given equation :)

3x - 7 = 4x

3(-7) - 7 = 4(-7)

Simplify.

-21 - 7 = -28

-28 = -28

Therefore, x = -7

~Hope I helped!~
Sauron [17]3 years ago
4 0
Hey!

Let's write it, 3x-7=4x
Add 7 to both sides,
3x-7+7=4x+7
3x=4x+7
Subtract 4x from both sides.
3x-4x=4x+7-4x
-x=7
Since we don't want a negative variable, we have to divide both sides by -1.
\frac{-x}{-1}=\frac{7}{-1}
Our answer would be,
x=-7

Thanks!
-TetraFish
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