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Snowflakelove319
in a trapazoid the diagonals are the same so therefore the two equations equal echother

3x+7=5x-11  solve for x by combining like terms

18=2x  then divide to unto multiplication

9=x

9 is the value of x

I hope I've helped!
Kaikerscupcake
Diagonals are congruent. (since the trapezoid is isosceles)

3x+7= 5x-11

Add 11 on both sides.

3x+18= 5x

Subtract 3x on both sides.

18= 2x

Divide by 2 into both sides.

x=9

I hope this helps!
~kaikers

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