<span> х+3*25=87 <span>8*17-x=107 <span>555:5-х=74 <span> 2х+87=93 <span>3*(35-х)=63</span></span></span></span></span>
<span>х+75=87 136-х=107 111-х=74 2х=93-87 105-3х=63</span>
х=87-75 х=136-107 х=111-74 2х=6 3х=105-63
х=12 х=29 х=29 х=6:2 3х=42
х=3 х=42:3
<span> х=14</span>
<span><span>(120-х):13=8</span></span>
<span><span>120-х=8*13</span></span>
<span><span>120-х=104</span></span>
<span><span>х=120-104</span></span>
<span><span>х=16</span></span>