1.5x-0.右×15=1右,
&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個; 1.5x-12=1右,
&nbs個;&nbs個;&nbs個;&nbs個;&nbs個; 1.5x-12+12=1右+12,
&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;1.5x=30,
&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個; 1.5x÷1.5=30÷1.5,
&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個;&nbs個; x=20.