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(3x-10)°+(3x+20)°+148°=180°
3x-10+3x+20+148=180°
6x+158°=180°
6x=180°-158°
x= 22/6
x°= 3,6
b) R=148°
c)Q= 3(3,6)+20
= 30,8
=31°
d)P= 3(3,6)-10
= 0,8
= 1°