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3 years ago

12

7x +4 what property is it

1 answer:

Anni [7]3 years ago

8 0

Answer:

commutative property of multiplication

Step-by-step explanation:

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$DF=DE+EF\\\\DF=9x-39\\DE=47\\EF=3x+10\\\\\text{substitute}\\\\9x-39=47+3x+10\\9x-39=3x+57\ \ \ |-3x\\6x-39=57\ \ \ \ |+39\\6x=96\ \ \ \ |:6\\x=16\\\\\text{put the value of x to the expression}\ 3x+10\\\\EF=3(16)+10=48+10=58$

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3 years ago