<span>5у+27=4у+21</span>
<span>5у-4у=21-27</span>
<span>у=-6</span>
<span><span>0,37х-8,92=0,38х-3,59</span></span>
<span><span>0,37х-0,38х=-3,59+8,92</span></span>
<span><span>-0,01х=5,33</span></span>
<span><span>х=5,33:(-0,01)</span></span>
<span><span>х=-533</span></span>