Help? :) Math questionsss...:)?

Question

what's x?

5x+7+3x-5

7+3x=5x-5

2.5x-8=5x+2 thankss.. :)

Answer 1

first one is not an equation.

For second and third questions, you just need to know 1 rule. What you do to one side of the equation, you have to do to the other side.

E.g. 7+3x=5x-5

minus 3x to both sides: 7 = 2x-5

plue 5 to both sides: 12 = 2x => x = 6

Apply the same concept to the third question.

Answer 2

your missing an equals sign in the first one but for 2 and 3:

7 + 3x = 5x-5

7+5 = 5x-3x

12 = 2x

x = 6

2.5x - 8 = 5x + 2

2.5x-5x = 8+2

-2.5x = 10

x = -4

if the first one is 5x + 7 = 3x -5 here it is:

5x -3x = -5-7

2x = -12

x=-6

Answer 3

5x + 7 = 3x - 5 (subtract 3x from both sides)

2x + 7 = -5 (subtract 7 from both sides)

2x = -12 (divide both sides by 2)

x = -6 <===ANSWER

7 + 3x = 5x - 5 (subtract 5x from both sides)

7 - 2x = -5 (subtract 7 from both sides)

-2x = -12 (divide both sides by -2)

x = 6 <===ANSWER

2.5x - 8 = 5x + 2 (subtract 5x from both sides)

-2.5x - 8 = 2 (add 8 to both sides)

-2.5x = 10 (divide both sides by -2.5)

x = -4 <===ANSWER

Answer 4

x=6