a) х+3=3х-7
x-3x=-7-3
-2x=-10
x=-10÷(-2)
x=5
б) 2*(х-5)=9
2x-10=9
2x=19
x=8
в) 7-(2х+3)=9
7-2x-3=9
-2x+4=9
-2x=5
x=5÷(-2)
x=-2,5
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Answers & Comments
a) х+3=3х-7
x-3x=-7-3
-2x=-10
x=-10÷(-2)
x=5
б) 2*(х-5)=9
2x-10=9
2x=19
x=8
в) 7-(2х+3)=9
7-2x-3=9
-2x+4=9
-2x=5
x=5÷(-2)
x=-2,5