3(x + 1) - 2x = -6 what is x i need halp

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

Mary beth used the mapping rule to find the coordinates of a point that had been rotated 90° counterclockwise around the origin. examine the steps to determine whether she made an error. m (3, –6) is rotated 90° counterclockwise. (x, y) → (–y, x) 1. switch the x- and y-coordinates: (6, –3) 2. multiply the new x-coordinate by –1: (6(–1), –3) 3. simplify: (–6, –3) .

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes