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   ocr: Solve: 3x+4y--25 (1) x-4y-29 (2) 3x+4y=-25 x-4y=29 4x+0y=4 4x=4-x=1 3r4p--6-31-47--3 - 24--28-y--7 - The solution to this system is (1,-7). Elimination by Addition: Example 1