troyjones4343 troyjones4343 07-01-2020 Mathematics contestada Step 1: (3x + 12y) + (10x - 5y) Step 2: (3x + 12y) + (-5y + 10x) Step 3: 3x + (12y – 5y) + 10x Step 4: 3x + 10x + (12y - 5y) Step 5: 13x + 7y Steps