If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
r = (P/2)*(L+a) // - (P/2)*(L+a)
r-((P/2)*(L+a)) = 0
r-1*1/2*P*(L+a) = 0
r-1*1/2*P*(L+a) = 0
r-1/2*L*P-1/2*P*a = 0
r-1/2*L*P-1/2*P*a = 0
x belongs to the empty set
| g(-1)=-2x-9 | | 8(x)(x)+8x-448=0 | | 60-x+5x=180 | | 4x^2+4xy-15y^2= | | (9-7)-(16/8)^2 | | 16=2t(6-t) | | (8x)(8x)+8x-448=0 | | 2x+2y=12x-3y-20 | | c/2+78=2b | | -28+2(3x-1)=9x-3(5+3x) | | (2x-9)(5x+6)= | | -2(x-3)+5=3(x-1) | | -2.5v+1.8=1+8v | | 3x+10=28+x | | 6(v+2)-2v=2(2v+2)-7 | | g(2-7t)=13 | | 23-5(2x+1)=-20x+5(3+5x) | | (5x+3)(x-3)=0 | | 745/10 | | 2[3-(-5x-4)]=20x+22 | | (5x+3)(b-3)=0 | | -5+(3x-12)=-3x-(3-4x) | | 3-2x=40 | | -4(2r+5)=-44 | | (-20)(-20)+20=x | | x^2+4=-2 | | 4+.15(20)=y | | 1/2r+3s=1 | | .06(x+5)=.03(2x+6)+.12 | | 5/6x=7-11/12x | | 22x-3(5x+4)=16 | | x/4-x/8+9=x+9 |