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90-(180-x))=10
90-180+x=10
x-90=10
2.-C(x)=70
90-x=70
x=160
3.-x+y=90 +
x-y=60
2x=150
x=75
y=15 rpta:15
4.-180-x=3x
4x=180
x=45
5.-(180-x)-(90-x)=3x
180-x-90+x=3x
90=3x
x=30
6.-
2k+3k=90
5k=90
k=18
3k-2k=k=18