(x-6)+(x-3)+x+(x+3)+(x+6)=150

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(x-6)+(x-3)+x+(x+3)+(x+6)=150(x-6)+(x-3)+x+(x+3)+(x+6)=150(x-6)+(x-3)+x+(x+3)+(x+6)=150(x-6)+(x-3)+x

(x-6)+(x-3)+x+(x+3)+(x+6)=150
(x-6)+(x-3)+x+(x+3)+(x+6)=150

(x-6)+(x-3)+x+(x+3)+(x+6)=150
(x-6)+(x-3)+x+(x+3)+(x+6)=150
x-3+x-3+x+x+3+x+6=150
5x=150
x=30