Ответ:
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-18x + 15xy - 56,5x + 12xy = 27xy - 74,5x
-18x+15xy-56,5x+12xy=-74,5x+27xy
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Ответ:
===================================
-18x + 15xy - 56,5x + 12xy = 27xy - 74,5x
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Ответ:
-18x+15xy-56,5x+12xy=-74,5x+27xy