3Х+7Х+18=178
10Х+18=178
10Х=178-18
10Х=160
Х=160÷10
Х=16
3×16+7×16+18=178
178=178
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3Х+7Х+18=178
10Х+18=178
10Х=178-18
10Х=160
Х=160÷10
Х=16
3×16+7×16+18=178
178=178