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50+x+x=180
50+2x=180
2x=180-50
2x=130
x=130÷2
x=65
b)
x+5x+2x=180
8x=180
x=180÷8
x=22,5 cm *sepertinya
c)
60+3x+2x=180
60+5x=180
5x=180-60
5x=120
x=120÷5
x=24 cm
d)
4x+3x+90=180
7x+90=180
7x=180-90
7x=90
x=90÷7
x=*nggak yakin*