To answer the positive equations all you would do is add them like regular number like #1. Is 4+8 which would obviously equal 12 because you’re just adding them, but when it’s something like #2. What the easiest thing you would do is look at a number line and start at -7, then you would add +8 so you would go towards the positive side so -7+8=1
15x-621x/2+3. Multiply everything by 2: 30x-12=21x+6. Combine like terms: 9x=18. Get the unknown by itself: 9x/9=X. 18/9=2. X is less than or equal to 2 :)
21x/2+3. Multiply everything by 2: 30x-12=21x+6. Combine like terms: 9x=18. Get the unknown by itself: 9x/9=X. 18/9=2. X is less than or equal to 2 :)