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)
15 = (-3/7)*x // - (-3/7)*x
15-((-3/7)*x) = 0
(3/7)*x+15 = 0
3/7*x+15 = 0 // - 15
3/7*x = -15 // : 3/7
x = -15/3/7
x = -35
x = -35
| -134=-8n+10 | | 78-5x=19x | | 0=x^4-49x^2 | | -8x+y=29 | | 54=y | | 3.9+M=8.6 | | 7x-8x=10-25 | | 3b/4=11/2 | | 7/9j=10 | | b^2+7b-39=5 | | 12.8=4v | | -9x+15=6x | | 6x+6=-4x-34 | | -7v-10=-73 | | F-5(2)=3 | | 12.8=4 | | 8(x-9)=3 | | 5=3e^7*x | | m^2+3m-44=-4 | | 45=5x^(1/2) | | y-3/4=-7/12 | | 5=3e^7x | | 3.9+M=86 | | w/10.24=8 | | 64=12x+x | | 3/7x=1 | | -4y+10=-8y-14 | | 3x-4x=4x-6 | | 9t-21=3(x+7)6+t | | 0.3(2y-4)=-0.2(y-2) | | 2x^2-500=0 | | 90-x=1/2(180-x)-8 |