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-3x>1-7
-3x>-6 /:(-3)
x<2
6(x^+2)=3x(2x+5)-21
6x^+12=6x^+15x-21
-15x=-21-12
-15x=-33/:(-15)
x=2,2
6x^=6x^+15x-8/+6x^
12x^=15x-8