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for 2nd of first is :-
(x+10)+(x+20)+x =180
2x+30+x = 180
3x = 180 - 30
3x = 150
x = 150 ÷ 3
x = 50
(x+10)+(x+20)+x =180
2x+30+x = 180
3x = 180 - 30
3x = 150
x = 150 ÷ 3
x = 50
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