3. 2/7x-1/14x=-3

5. -3/4x+1/4=1/2

6. 1/4x+2=3/4

i don't understand these

You’re solving for x, and you need to isolate x so it equals one number on the other side. Multiply by both sides by 14. 4x - 1x = -3, which reduces to 3x = -3, so x = -1. For 5, multiply both sides by 4. -3x + 1 = 2 which reduces to -3x = 1, so x = -1/3. For 6, multiply both sides by 4. x + 8 = 3. So x = -5. Make sure to check by plugging in x for each problem.