Solve 13x+y + 13x-y = 34 & 123x+y - 123x-y = -18
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Step-by-step explanation:
- 13 x + y + 13x- y =34
- 26x=34
- x=34/26
- x=17/13
- 123x+y- (123x-y) =-18
- 123x -123x +y +y=-18
- 2y=-18
- y=-9
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