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(7-x)*(-x-19)*(13-x)+72*(x+19)+240*(7-x)+120*(13-x)-2880 = 0
x-z;z-y;x-y;2*x-y-z
sin(-1/2)/sin(-16/25) = x
sin(-1/2)/sin(-16/25) = 0
(4/7)*x-(3/2) = x-(35/28)
| 3(5x+11)=4(x+44) | | X+y+9z=-6 | | 36=t-5+-12 | | 12=s-5 | | 12j+5=8k+25 | | 4/7x-3/2=x-35/28 | | 5k^2+12k-4=0 | | 6x-2=18+2x | | -3(7-4)=-4 | | X+y+9z=-8 | | -1x+-2=1+-2x | | 8x+63=x-21 | | X+6=7.7 | | (-1/3)t=4/3 | | 4/7x-8=-12 | | 19x-6=13x+9 | | 2(3x-3)-4(5x-3)=x(x-3)-x(x+5) | | 3x+2=6x-28 | | (-1/3t=4/3 | | -7(y+2)+3(4y-4)=4(y-3)+8 | | X-61=15 | | A^2=5a+104 | | F(x)=-3x^3-15x^2-12x | | x/-15=-6 | | -36=4w-8 | | 11-2(p+5)=p-5 | | 7x^2+45x+50=0 | | 2(3x-3)-4(5x+3)=x(x-3)-x(x+5) | | 8x-5-11x=9+4x | | 18=(-1/2)y | | 10/1×5/6 | | 3x-11=-23 |