How many solutions are there to this equation?

7x - 3(x-1)=2(2x+3)

The angle of a triangle are given as 6x,(x-3), and (3x+7). find x then find the measures of the angles

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Which translation maps the vertex of the graph of the function f(x) = x2 onto the vertex of the function g(x) = x2 – 10x +2?