That doesnt make sense
2x + 8 = 20
Then x = 6
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2x + 5 = 13 2x = 8 2x/2 = 8/2 x=4
2x-4y=-8-2x......-2x-4y=-2x-8(-4y)/-4 | (-2x-8)/-4y=1/2x+2
y=6x-16 y=-2x+8
2x+8 = 6 2x = 6-8 2x = -2 x = -1
2x-3 = 17 2x = 17+3 2x = 20 x = 10