Ответ:
a+a+2b+b = 2a + 3b; 5x+6x + y = 11x +y; x+2y+2x+3y = 3x+5y
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Ответ:
a+a+2b+b = 2a + 3b; 5x+6x + y = 11x +y; x+2y+2x+3y = 3x+5y