Mathematics, 30.08.2019 06:50 Ryantimes2

9x+3y+12y-0.9x=9x+(-0.9x)+3y+12y the equation is commutative property.. how did they get that second equation?

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9x+3y+12y-0.9x=9x+(-0.9x)+3y+12y the equation is commutative property.. how did they get that second...