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Mathematics, 26.06.2019 18:10 jaylynomalley

What is the justification for the step taken from line 2 to line 3?
3x +9-7x = x+10+ x
-4x+9-2x+10
- 6x +9-10
6x=1
x = -1/6

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What is the justification for the step taken from line 2 to line 3?
3x +9-7x = x+10+ x
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