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2014-09-29T09:06:59+03:00
A) 5x+7-3x-12=6-15+3x
2x-5=3x-9
3x-2x=9-5
x=4

b) 30-24x+64-7=54-30x+45+18
87-24x=117-30x
30x-24x=117-87
6x=30
x=5

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