what is the value of x? 4x-3=12

Question

Please help answer this question. what is the value of x? 4x-3=12

Answer 1

4x-3=12,

4x=15 (add 3 to each side),

x=15/4 (divide each side by 4),

x=3¾ (convert to mixed number, if necessary)

Another method (Do-Undo):

Remember: divide is multiply undone; add is subtract undone.

DO: 4 times x→subtract 3 from product→result is 12

Now reverse the process:

UNDO: Start with result 12→add 3=15→15 divided by 4→x=15÷4 or 15/4 or 3¾.

 

Answer 2

4x-3 = 12

4x  = 12+3

4x = 15

x = 15÷4

x = 3.75