Answer:
x = 21
Explanation:
If lines AB and CD are parallel, then we can assume that m<5 and m<6 are supplementary that is the sum of both angles is 180degrees
Hence;
3x - 31 + 148 = 180
3x + 117 = 180
Subtract 117 from both sides
3x+117-117 = 180 - 117
3x = 180 - 117
3x = 63
x = 63/3
x = 21
Hence the value of x will be 21 if both angles are supplementary