<span>-x + 1 + 2(x - 1) = -2(-2 - x) + 2
-x + 1 + 2x - 2 = 4 +2x + 2
x - 1 = 2x + 6
x = -7
</span>
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3х(х+4)=0
3х=0 или х+4=0
х=0 х=-4
х2=27:3(икс в квадрате равно двадцать семь разделить на три)
х2=9
х=/9(икс равно корень из 9)
х=3