What is the best estimate for the percent equivalent of 7/15

I've never been good at math he told he loves but he keeps cheating on me, so it ain't adding up sis

Create and solve a linear equation that represents the model, where squares and triangles are shown evenly balanced on a balance beam. assume the weight of a square is 1 unit and the weight of a triangle is unknown.

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?