Ответ:
1)-4m+3m-15n+18n = -1m+3n
2)b+7-b-14+b = b-7
3)-2x+6+4x+4 = 2x+10
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Ответ:
1)-4m+3m-15n+18n = -1m+3n
2)b+7-b-14+b = b-7
3)-2x+6+4x+4 = 2x+10