Given the length of two sides of a triangle, how to find the included angle? How to find the key on the scientific calculator?

Triangle only know that the length of two sides is not fixed, can not find the angle, if it is three sides, then it can use C = 1 / 2 ab Sina to calculate the angle, using the arcsin function on the calculator

60% x-4% = (x + 3) × 50% to solve the equation

60%x-4%=(x+3)×50%
0.6x-0.04=0.5x+1.5
0.6x-0.5x=1.5+0.04
0.1x=1.54
x=15.4

Solving equation (1 + X%) * 50 = 60

50＋50％x＝60
0．5x＝10
x＝20

Solve the equation 3x + 1 / 2-5 = 2 (x-3) + 3

3x+1/2-5=2(x-3)+3
3x-9/2=2x-3
3x-2x=-3+9/2
x=3/2

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