If it's not what You are looking for type in the equation solver your own equation and let us solve it.
a in (-oo:+oo)
(1/2)*a+2.5 = 18 // - 18
(1/2)*a-18+2.5 = 0
1/2*a-15.5 = 0 // + 15.5
1/2*a = 15.5 // : 1/2
a = 15.5/1/2
a = 31
a = 31
| (800/8*3+25)-(20+20*6/2) | | -4X-10=-66+4X | | x-18=33 | | y=(-3)+9/2(-3)+3 | | X=2y-z(4) | | -(-4m+3)=11 | | (200/10*3-2)*(100*3+200-20) | | X=2y-z-4 | | 67=21-x | | (144/12*3)-(21/7+16) | | -5(3+y)=30 | | x-22=17 | | x-41=-26 | | 9t^2+14t-8=0 | | 7(4x-3)=-133 | | 8x-16=2(x+4) | | -4x^2+8x=0 | | y=-2(-3)2-3x+5 | | (1000/10+20)-(20+200/10) | | 2x-12=4x-32 | | 9=n-(49) | | 3X-8=6X-23 | | X^2+3x-5=-1 | | 5x+15=12x-27 | | -30-9y+17=-28y+47+9y | | 81=r-(47) | | 7u+6=u-54 | | X^2-x-46=3x-1 | | 5(7+3x)=215 | | 13+x=29 | | (1025/25+20)*3 | | p-(-9)=-27 |