<span>(z-20,4):9=1,3</span>
<span>z-20,4=1,3*9</span>
<span>x-20,4=11,7</span>
<span>z=11,7+20,4</span>
<span>z=32,1</span>
<span>(3,5+y) : 5=1,5</span>
<span>3,5+y=1,5*5</span>
<span>3,5+y=7,5</span>
<span>y=7,5-3,5</span>
<span>y=4</span>
<span><span>(56,5-у):8=0,6</span></span>
<span><span>56,5-y=0,6*8</span></span>
<span><span>56,5-y=4,8</span></span>
y=56,5-4,8
y=51,7