supunctul c pls E URGENT
DAU COROANA
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Răspuns:
3[4|2x+5|+2(3x-7)+5]=5(6x+7)-12x+22
3[4|2x+5|+6x-14+5]=30x+35-12x+22
3[4|2x+5|+6x-9]=18x+57/:3
4|2x+5|+6x-9=6x+19
4|2x+5|+6x-6x=19+9
4|2x+5|=28/:4
|2x+5|=7 2x+5=+-7
2x+5=7 2x=7-5=2/:2 x=1
2x+5=-7 2x=-7-5=-12/:2 x=-6
x={-6,1}