<span>12х-х=55</span>
<span>11х=55</span>
<span>х=55:11</span>
<span>х=5</span>
<span>Ответ:5</span>
<span><span>2(х+3)=16</span></span>
<span><span>2х+6=16</span></span>
<span><span>2х=16-6</span></span>
<span><span>2х=10</span></span>
<span><span>х=10:2</span></span>
х=5
Ответ:5
<span>5х+5*3+7=3х+3*12</span>
<span>5х+15+7=3х+36</span>
<span>5х-3х=36-15-7</span>
<span>2х=14</span>
<span>х=14:2</span>
<span>х=7</span>
<span>Ответ:7</span>
<span><span>5х+15+7=3х+36</span></span>
<span><span>5х-3х=36-15-7</span></span>
<span><span>2х=14</span></span>
<span><span>х=14:2</span></span>
<span><span>х=7</span></span>
<span><span>Ответ:7</span></span>
<span><span>2(а+2)-10=6(3-а)</span></span>
<span><span>2а+4-10=18-6а</span></span>
<span><span>2а+6а=18-4+10</span></span>
<span><span>8а=24</span></span>
<span><span>а=24:8</span></span>
<span><span>а=3</span></span>
<span><span>Ответ:3</span></span>
<span><span><span>3(2y-1)+6(3y-4)=83+5(y-3)</span></span></span>
6у-3+18у-24=83+5у-15
6у+18у-5у=83-15+3-24
19у=95
у=95:19
у=5
Ответ:5