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=x+12 = 24x/16
=x+12= 3x/2
=2x+24=3x
x=24 ..
25.a4+b1=180
3x+5+4x+35=180
7x=180-40
x=140/7=20
b1+b2=180
4x+35+b2=180
4(20)+b2=180-35
80+b2=145
b2=145-80= 65
a4=b1=4x+35
a4=4(20)+35=80+35=115