15pr -20pr +5pr =.............................. 2a +3a =............................ 20a +6a =.......................... 6x +5x =.................... -8ac +3ac =....................... 6a²b +7a²b +3a²b =............................... 7a²b²c +a²b²c =...................... ab +ab+ab=................... abc+3abc+4abc =............................. +4xy -2xy =....................... -4xy +2xy =..................... -4xy -2xy =............................ 6x²y-7x²y=...........................
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