ash3246
22.04.2020 •
Mathematics
I’ve attached the picture and will be giving out brainliest answer! (^o^)(^O^)
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Ответ:
From figure we can see that:
DE=DF -EF
x+7 = 4x+2-7
combining like terms
x+7=4x-5
subtract x on the right side from 4x
7=(4x-x) -5
7=3x-5
add 5 on the left side
7+5=3x
12=3x
divide both sides by 3
x=4
DE=x+7 =4+7
DE=11