Решите 3 уравнения плиз!!!!! (распишите подробно) а)x+|x|+7x+12=0 б)-2x^2+6/x+6=11x/6+x в)x^4+3x^2-10=0

[latex]a) x+|x|+7x+2=0[/latex] [latex]8x+|x|+12=0[/latex] [latex]8x+x+12=0,x \geq 0 [/latex] [latex]8x-x+12=0, x\ \textless \ 0[/latex] [latex]x=- \frac{4}{3} ,x \geq 0[/latex] [latex]x=- \frac{12}{7} ,x\ \textless \ 0[/latex] x∈∅ [latex]x=- \frac{12}{7} [/latex] ___________________ в)[latex]x^4+3x^2-10=0[/latex] [latex]x^2=t[/latex] [latex]t^2+3t-10=0[/latex] [latex]D=9+40= \sqrt{49} = 7^2[/latex] [latex] t_{1} =2[/latex] [latex] t_{2} =-5[/latex] [latex]x^2=t[/latex] [latex]x^2=2[/latex] [latex]x^2=-5[/latex] x∉R [latex] x_{1} = \sqrt{2} [/latex] [latex] x_{2} =- \sqrt{2} [/latex] ____________________