(2/3)x-(7/15)=0.8*(2/3).
(2/3)x-(7/15)=0.8*(2/3)．
<gadget id="calculator">7 / 15</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">0.8 * (2/3)</gadget>
<output>0.533333</output>

<gadget id="calculator">(7/15) + 0.533333</gadget>
<output>1</output>

<gadget id="calculator">1 / (2/3)</gadget>
<output>3/2 = around 1.5</output>

<result>3/2 = around 1.5</result>