13х+4х=408
x(13+4)=408
17x=408
x=24
х+18х=3857
x(1+18)=3857
19x=3857
x=203
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Verified answer
13х+4х=408
x(13+4)=408
17x=408
x=24
х+18х=3857
x(1+18)=3857
19x=3857
x=203