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15=8x-5x
15=3x
x=15/3
x=5
b)
4x=2-1
4x=1
x=1/4
c)
25-5=3y-y
20=2y
20/2=y
y=10
d)
16-5=10x-5x
11=5x
11/5=x
e)
8x-6x=27-21
2x=6
x=6/2
x=3