Answer:
x = 10
Step-by-step explanation:
1) Subtract x from both sides.
4x − x = 30
2) Simplify 4−x to 3x
3x = 30
3) Divide both sides by 3
x = 
4) Simplify
to 10
x = 10
Step-by-step explanation:
4 for a pen
7 for 1 note book
Answer:V=whl
Step-by-step explanation: