(2,5a+3b-2,5)-(-0,5a-1,5b+2,5)= 2,5a+3b-2,5+0,5a+1,5b-2,5= 3a+4,5b-5
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(2,5a+3b-2,5)-(-0,5a-1,5b+2,5)= 2,5a+3b-2,5+0,5a+1,5b-2,5= 3a+4,5b-5