Answer:
X+30+x+10=180
combine like terms
2x+40=180
subtract 40 from both sides
2x=140
divide by 2
x=70
but for you it is 2x+40=180
choice 1) 2x + 40 = 180
Explanation:
(x + 10) + (x + 30) = 180
2x+ 40 = 180
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