<span> 2(а+2)-10=6(3-а)</span>
<span>2a+4-10=18-6а</span>
<span>2а+6а=18-4+10</span>
<span>8а=24</span>
<span>а=24:8</span>
<span>а=3</span>
<span>Ответ:3</span>
<span><span>3(2у-1)+6(3у-4)=83+5(у-3)</span></span>
<span><span>6у-3+18у-24=83+5у-15</span></span>
<span><span>6у+18у-5у=83-15+3+24</span></span>
<span><span>19у=95</span></span>
<span><span>у=95:19</span></span>
<span><span>у=5</span></span>
<span><span>Ответ:5</span></span>
225:х+11=15
225:х=15-11
225:х=4
х=225/4=56,25
Ответ: х=56,25
X-первое число
y-второе число
х+у=100
10х+у=955
у=100-х
10х+100-х=955
9х=855
х=855/9
х=95
у=100-95
у=5