<span>(937-х*54)*13-198=49</span>
<span>(937-54х)*13=49+198</span>
<span>(937-54х)*13=247</span>
<span>937-54х=247:13</span>
<span>937-54х=19</span>
<span>54х=937-19</span>
<span>54х=918</span>
<span>х=918:54</span>
<span>х=17</span>
19+9=28
28:7=4(по таблице умножения
-52x + 96x=119-101
44x=18
x=18 9
-- = ---
44 22