If it's not what You are looking for type in the equation solver your own equation and let us solve it.
45.9=-5.1a
We move all terms to the left:
45.9-(-5.1a)=0
We get rid of parentheses
5.1a+45.9=0
We move all terms containing a to the left, all other terms to the right
5.1a=-45.9
a=-45.9/5.1
a=-9
| 3x+10=-2x-15 | | 10v-6v=4 | | 2x^2+20=50 | | 0.4x+2.9=1.51 | | 4x+6=2(x+10) | | 3.9x+0.6(3.4x-0.8=13.182 | | 12=7u-4u | | 4-x=5x-10 | | 2(x/15)x10000000=150 | | 15+4x=5-6x | | 2.4x-0.07(4x-0.3=1.505 | | 8x-5=5x+4x | | 34=3.4h | | (5x+1)^2-16=0 | | 51-9x=10x+13 | | -9=-5.4+z | | 3/8=1/3+z | | -20=4w+8 | | n-3/4=24 | | -5+r/4=3 | | n-5-3n=-11 | | 3(6)^x+2=45 | | -3x-2+5=34 | | 9x⁴+10x³-6x²+15=0 | | 46x+62x-41500=0 | | 1/5=x1/50 | | v/9=8/13 | | b+4=-201/4 | | 2u+3u-24=16 | | 5b-2=0.5(10b-4) | | N^2+12n-8=8 | | (5/8-x)/x=9/4/3/8 |