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Answer:
The step by
13x-4y+7z-6z+6x+3y
=>13x+6x-4y+3y+7z-6z
=>19x-y+z
Step-by-step explanation:
6x-4y-4z+2x+4y-7
6x+2x-4y+4y-7
8x-7
8x=7
x=8/7
x=1.1428571429
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