Упростить:
16x+x-3x. 5a-3ab+8a. 5x+6x+7y+8y. 18xy+28xy-4. 73c+29c+27c. 37a+42b-53c.
Решить уравнения:
7x=49. a-800=1000. 2x+3x=10
100+y=300. 18:c=1. 376-z=0
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