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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=1x=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-4x+9=2x+10-6x+9=10-6x=1x=1/6

User Dougvj
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\begin{gathered} -4x+9=2x+10,\text{ by addition property of equality, we can add }-2x\text{ on both sides} \\ -4x-2x+9=2x-2x+10,\text{ the }2x\text{ in the right hand side is cancelled out and} \\ -6x+9=10,\text{ we simplify the left side} \end{gathered}

User Saeed Ur Rehman
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