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a) x+13=22
b) x•6=90
c) x-8=19
d) x:4=7
2.
15=3x
23=4x+3
10=x-7
60=x:5
20=4x:2
10=1/5(x:2)
3.
X•4
2x•10/2
(3x+x)•4/2
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