What has the same solution as -4(6)

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

Which inequality comparing two of the expressions is true when 0.7 < x < 0.9

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?