3)
3X+10=2X+20
3X-2X=20-10
X=10
3X+10+B=180
30+10+B=180
B+10=150
4)
3X+10=4X-20
10+20=4X-3X
30=X
B+3X+10=180
B+90+10=180
B=80
B+30=110
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3)
3X+10=2X+20
3X-2X=20-10
X=10
3X+10+B=180
30+10+B=180
B+10=150
4)
3X+10=4X-20
10+20=4X-3X
30=X
B+3X+10=180
B+90+10=180
B=80
B+30=110