The value of angle B in the triangle is 63°
A triangle is a three sided polygon. The sum of angle in a triangle is 180°
Therefore;
3x - 3 + 2x - 1 + 3x = 180
collect like terms
8x -4 = 180°
8x = 176
divide both sides by 8
x = 176/8
x = 22
therefore the value of x is 22
angle B = 3x - 3
= 3(22) - 3
= 66 - 3
= 63°
Therefore, the measure of angle B is 63°