Answer:
[tex] x = 39 [/tex]
Explanation:
Recall that one of the properties of a rhombus is that opposite angels are congruent. Therefore, given Rhombus RSTU, thus:
m<T = m<R
[tex] 3x - 51 = 2x - 12 [/tex]
Collect like terms
[tex] 3x - 2x = 51 - 12 [/tex]
[tex] x = 39 [/tex]
