I need serious help can anyone help me atleast with 3?

Answer:z = 14Step-by-step explanation:Solve for z: (4 z)/7 - 15 = -7 Put each term in (4 z)/7 - 15 over the common denominator 7: (4 z)/7 - 15 = (4 z)/7 - 105/7: (4 z)/7 - 105/7 = -7 (4 z)/7 - 105/7 = (4 z - 105)/7: 1/7 (4 z - 105) = -7 Multiply both sides of (4 z - 105)/7 = -7 by 7: (7 (4 z - 105))/7 = -7×7 (7 (4 z - 105))/7 = 7/7×(4 z - 105) = 4 z - 105: 4 z - 105 = -7×7 7 (-7) = -49: 4 z - 105 = -49 Add 105 to both sides: 4 z + (105 - 105) = 105 - 49 105 - 105 = 0: 4 z = 105 - 49 105 - 49 = 56: 4 z = 56 Divide both sides of 4 z = 56 by 4: (4 z)/4 = 56/4 4/4 = 1: z = 56/4 The gcd of 56 and 4 is 4, so 56/4 = (4×14)/(4×1) = 4/4×14 = 14: Answer:  z = 14