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a) x+75+30=180
x+105=180
x=180-105
x=75
b)x+x+x=180
3x=180
x=180÷3
x=60
c)x+70+60=180
x+130=180
x=180-130
x=50
d)2x+90+30=180
2x+120=180
2x=180-120
2x=60
x=60÷2
x=30
e)x+x+30=180
2x=180-30
2x=150
x=150÷2
x=75
f)x+50+38=180
x+88=180
x=180-88
x=92
x+105=180
x=180-105
x=75
b)x+x+x=180
3x=180
x=180÷3
x=60
c)x+70+60=180
x+130=180
x=180-130
x=50
d)2x+90+30=180
2x+120=180
2x=180-120
2x=60
x=60÷2
x=30
e)x+x+30=180
2x=180-30
2x=150
x=150÷2
x=75
f)x+50+38=180
x+88=180
x=180-88
x=92
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