решите уравнение:
1) 2х+7=х+5,5;
2) 9,5х+2=5,7х-5,6
3) 2,9х+7,4=х+1,7

2х+7=х+5,5
2х-х=5,5-7
1х=-1,5
х=-1.5:1
х=1.5
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9.5х+2=5,7х-5.6
9.5х-5.7х=-5.6-2
3.8х=-7.6
х=-7.6:3.8
х=-2
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2.9х+7.4=Х+1.7
2.9х-х=1.7-7.4
1.9х=-5.7
х=-5.7:1.9
х=-3
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