how do you sove , -3p+2(-3p+4)=-3p+38?

We need to plug it back in too but i do not understand,please help!
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1 Answer

-3x +2(-3x+4) =-3x+38

-3x -6x +8 +3x=38

-6x+8=38

-6x=30

x=-5
by

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