Question

$$\frac{ x+1 }{ 2 } - \frac{ x+3 }{ 5 } =0.8$$

Answer

x=3

Solution


Multiply both sides by \(10\) (the LCM of \(2, 5\)).
\[5(x+1)-2(x+3)=8\]
Expand.
\[5x+5-2x-6=8\]
Simplify  \(5x+5-2x-6\)  to  \(3x-1\).
\[3x-1=8\]
Add \(1\) to both sides.
\[3x=8+1\]
Simplify  \(8+1\)  to  \(9\).
\[3x=9\]
Divide both sides by \(3\).
\[x=\frac{9}{3}\]
Simplify  \(\frac{9}{3}\)  to  \(3\).
\[x=3\]