rezolvati , in multimea numerelor naturale, ecuatiile a) 2x+5=9 :b) 39-3x=15 :c) 7x+6=20 :d)2x-9=27. :e) 9x+5=86 :f) 5x-12=38 : g) 10x-25=15 h) 42-7x=0 i) 12x+14=50 j) 21x-12=30 k) 12x+71=143 l) 5x-21=134
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a)2x+5=9<=>2x=9-5<=>2x=4<=>x=2
b)39-3x=15<=>3x=15+39<=>3x=54<=>x=18
c)7x+6=20<=>7x=20-6<=>7x=14<=>x=2
d)2x-9=27<=>2x=27+9<=>2x=36<=>x=18
e)9x+5=86<=>9x=81<=>x=9
f)5x-12=38<=>5x=40<=>x=8
g)10x-25=15<=>10x=40<=>x=4
h)42-7x=0<=>7x=42<=>x=6
i)12x+14=50<=>12x=36<=>x=3
j)21x-12=30<=>21x=42<=>x=2
k)12x+71=143<=>12x=143-71<=>12x=72<=>x=6
l)5x-21=134<=>5x=134+21<=>5x=155<=>x=31
b)39-3x=15<=>3x=15+39<=>3x=54<=>x=18
c)7x+6=20<=>7x=20-6<=>7x=14<=>x=2
d)2x-9=27<=>2x=27+9<=>2x=36<=>x=18
e)9x+5=86<=>9x=81<=>x=9
f)5x-12=38<=>5x=40<=>x=8
g)10x-25=15<=>10x=40<=>x=4
h)42-7x=0<=>7x=42<=>x=6
i)12x+14=50<=>12x=36<=>x=3
j)21x-12=30<=>21x=42<=>x=2
k)12x+71=143<=>12x=143-71<=>12x=72<=>x=6
l)5x-21=134<=>5x=134+21<=>5x=155<=>x=31
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