Answer:
I feel you should do this on your own. Trust me, this is EASY algebra. I'm currently in algebra 2.
Explanation:
To solve these equations, you first need to move all variable numbers (Those with x) to one side of the equation, and the ordinary numbers to the other side. WHEN YOU DO THIS, REMEMBER TO FLIP THE SIGN OF THE MOVED NUMBER. if it was a positive number, it is now a negative, and vise-versa. Then add or subtract on both sides of the equation. In the end, you should come out with ONE answer on each side. Then, multiply or divide. You need to SUBSTITUTE X FOR ANOTHER NUMBER. Keep doing this until you have found the correct answer.
I will do #1 for you
3x - 4x - 7 = 0
1. move variables and numbers on opposite sides. (Make sure to flip the signs)
3x - 4x = 0 + 7
2. add and subtract
-x = 7
ANSWER FOR #1: x = 7
For that last bit just move the sign over from the x to the 7. But only in that circumstance.
You can check if this is correct by plugging the answer back into the equation as so:
3( -7) - 4(-7) = 0 + 7
-21 - -28 = 7
7 = 7
Hope I helped :)