Solve for x
x=1
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4x-21-x=-18
Subtract x from both sides.
3x-21=-18
Combine 4x and -x to get 3x.
3x=-18+21
Add 21 to both sides.
3x=3
Add -18 and 21 to get 3.
x=\frac{3}{3}
Divide both sides by 3.
x=1
Divide 3 by 3 to get 1.
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