Answer:
3
Step-by-step explanation:
mhm for your brother
anyways...
2x-3+6x = 21
Adding like terms
8x -3 = 21
Adding 3 on both sides
8x = 24
Dividing both sides by 8
x = 3
Simplifying
2x-3+6x=21 combine like terms
8x-3=21
Step 2
8x-3=21 Add 3 to the sides
8x=24
Step 3
8x=24 Divide the sides by 8
Your answer would be x=3
