If it's not what You are looking for type in the equation solver your own equation and let us solve it.
b in (-oo:+oo)
21250 = 85*(1/2)*(b+240) // - 85*(1/2)*(b+240)
21250-(85*(1/2)*(b+240)) = 0
(-85/2)*(b+240)+21250 = 0
21250-85/2*(b+240) = 0
21250-85/2*(b+240) = 0
11050-85/2*b = 0
11050-85/2*b = 0
11050-85/2*b = 0 // - 11050
-85/2*b = -11050 // : -85/2
b = -11050/(-85/2)
b = 260
b = 260
| 4.9q-2.4-5.1q=-1.2q-4.6 | | 3/a+5/6a=4 | | 0.5(2x+4)=12-3x | | 16250=(1/2)(65)(220+b) | | 9p-8r+7p-6r= | | 6q-2p+4q-5p= | | x+9(4)=6(x-4) | | 1s-3r+2s-8r= | | 6x+7(4)=2(5x+4) | | 4s-5+6s+6= | | 7r-1+9r+8= | | 0.2(x-4)=3.4 | | 7p-6+2p+7= | | 1p-4+6p+9= | | 8(x+5)+x=3(x+5)-5 | | 125/5=a | | 7(-3)-3y=6 | | 8s-7r+3s-8r= | | 5(-3)+13=4+y | | x+1/8+1-x+5/3 | | x^2-100x+900=0 | | 2x^2-12x-45=0 | | x+13/4=11/5 | | 0.05x-3.05=0.4(x-5) | | x=226/4 | | -4y+6=5y+3 | | -3/8y=-12 | | 8-5x=11x-24 | | 23-(x+7)=5x-8 | | 10/1.6=m | | 3(x+1)=24-8(x+5) | | 5s-3p+1s-8p= |