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180-50=130
130/2 = 65
2x=180-50
2x=130
x=130:2
x=65
(b)x+5x+2x=180
8x=180
x=180:8
x=22,5
(c)60+3x+2x=180
60+5x=180
5x=180-60
5x=120
x=120:5
x=24
(d)4x+3x+90=180
7x+90=180
7x=180-90
7x=90
x=90/7
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