(1) Answers

set all of them equal to 180 4x+10+2x+6x-10=180 12x=180 12x÷12=x 180÷12=15 x=15

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(1) Answers

set all of them equal to 180 4x+10+2x+6x-10=180 12x=180 12x÷12=x 180÷12=15 x=15

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