A
what is the justification for the step taken from line 2 to line 3?
3x+9-7x-x+10+
-4x+9 - 2x+10
-6x-9=10
-6x=1
a. the subtraction property of equality
b. the multiplication property of equality
c. combining like terms on one side of the equation
d. the distributive property

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