Bonsoir,
a. x-3=-1
x-3+3=-1+3
x=2
b. 2y=5
2y:2=5:2
y=2,5
c. 5x=2x+9
5x-2x=2x-2x+9
3x=9
3x:3=9:3
x=3
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Bonsoir,
a. x-3=-1
x-3+3=-1+3
x=2
b. 2y=5
2y:2=5:2
y=2,5
c. 5x=2x+9
5x-2x=2x-2x+9
3x=9
3x:3=9:3
x=3