x + 3/8 = 11/4
8x/8+3/8=22/8
8x+3=22
8x=22-3
8x=19
x=19/8
-3 - x = 8.2
-x=8.2+3
x=-11.2
x + 10(-2) = 10(2)
x=20-20
x=0
x + 50/3 = -1/3
3x/3+50/3=-1/3
3x+50=-1
3x=-1-50
3x=-51
x=-51/3
10(-3) - x = 10
-30-x=10
-x=10+30
x=-40
x + 2,45 = -8.5
x=-8.5-2.45
x=10.95
bonne courage ^^