Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$3x-(x-1)=9$$

Answer

x=4

Solution


Remove parentheses.
\[3x-x+1=9\]
Simplify  \(3x-x+1\)  to  \(2x+1\).
\[2x+1=9\]
Subtract \(1\) from both sides.
\[2x=9-1\]
Simplify  \(9-1\)  to  \(8\).
\[2x=8\]
Divide both sides by \(2\).
\[x=\frac{8}{2}\]
Simplify  \(\frac{8}{2}\)  to  \(4\).
\[x=4\]
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