l ll m angle 1=2x+y,angle4=x+2y,angle6=3y+20find angle 7and angle 8
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angle 1 = angle 4 ( vertically opposite angles )
angle 4 = angle 5 ( alternate angles)
angle 5 = angle 8 ( vertically opposite angles )
angle 6 = angle 7 ( vertically opposite angles )
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