d)3x+6x+3=0
e)x⁴-5x²=-4
f)x⁴-13x²+36=0
g)x²+3x+3>0
h)-x²+7x≤0
j)-x²+14x-49≥0
9x+3=0
9x=0-3
9x=-3 /:9
x=-3/9
x=-1/3
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d)3x+6x+3=0
9x+3=0
9x=0-3
9x=-3 /:9
x=-3/9
x=-1/3