9(143-13x)=234
143-13х=234:9
-13х=26-143
-х=-117:13
х=9
9*(143-13x)=234
143-13х=26
13х=143-26
13х=117
х=117:13
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Verified answer
9(143-13x)=234
143-13х=234:9
-13х=26-143
-х=-117:13
х=9
9*(143-13x)=234
143-13х=234:9
143-13х=26
13х=143-26
13х=117
х=117:13
х=9