20=3x-1
move -1 to the other side
sign changes from -1 to +1
20+1=3x-1+1
20+1=3x
21=3x
divide both sides by 3 to get x by itself
21/3=3/3x
Cross out 3 and 3, divide by 3 and then becomes 1*1*x=x
21/3=x
Answer:
x=7
Let’s solve your equation step-by step.
Step 1:flip the equation.
3x-1=20
Step 2:Add 1 to both sides.
3x-1+1=20+1
3x=21
Step 3:divide both sides by 3.
3x/3=21/3
X=7
