Mathematics, 12.12.2019 22:31 dntestkly7509

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
the subtraction property of equality
the multiplication property of equality
combining like terms on one side of the equation
the distributive property

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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+...