3x+7=5x-21 Find the value of x

Since 5x contains the variable to solve for move it to the left-hand side of the equation by subtracting 5x from both sides.

3x+7-5x=-21

Add 3x and - 5x to get - 2x.

-2x+7=-21

Since 7 does not have the variable to solve for, move it to the right hand side of the equation by subtracting 7 from both sides.

-2x=-7-21

Subtract 21 from - 7 to get - 28.

-2x=-28

Divide each term in the equation by - 2.

x=14

Answer:

x=14

So try to get the x term to one side by itself

add 21 to both siede

3x+28=5x

subtract 3 x from both sides

28=2x

divide 2

14=x