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5x-7+2x-13+x=180
(5x+2x+x)-7-13=180
8x-20=180
8x = 200
x =200/8
x = 25
= 8x-7-13=180
= 8x-20 = 180
= 8x = 180+20
= 8x = 200
= x = 200/8
= x = 25