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5x-30=2x+15
5x-2x=15+30
3x=45
x=15
sudut A &D shdp, jd sama besar
4y+25=4y-5
yg ini g bisa d cari
(5x-30)=(2x+15)
5x-2x=30+15
3x=45
x=45:3
x=15
4y+25+4y-5=180
4y+4y+25-5=180
8y+20=180
8y=180-20
8y=160
y=20