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2\times 2=2x-1+c
Multiply both sides by 2.
4=2x-1+c
Multiply 2 and 2 to get 4.
2x-1+c=4
Swap sides so that all variable terms are on the left hand side.
-1+c=4-2x
Subtract 2x from both sides.
c=4-2x+1
Add 1 to both sides.
c=5-2x
Add 4 and 1 to get 5.
2\times 2=2x-1+c
Multiply both sides by 2.
4=2x-1+c
Multiply 2 and 2 to get 4.
2x-1+c=4
Swap sides so that all variable terms are on the left hand side.
2x+c=4+1
Add 1 to both sides.
2x+c=5
Add 4 and 1 to get 5.
2x=5-c
Subtract c from both sides.
\frac{2x}{2}=\frac{5-c}{2}
Divide both sides by 2.
x=\frac{5-c}{2}
Dividing by 2 undoes the multiplication by 2.