If it's not what You are looking for type in the equation solver your own equation and let us solve it.
Simplifying
2r2 + -85 = -7
Reorder the terms:
-85 + 2r2 = -7
Solving
-85 + 2r2 = -7
Solving for variable 'r'.
Move all terms containing r to the left, all other terms to the right.
Add '85' to each side of the equation.
-85 + 85 + 2r2 = -7 + 85
Combine like terms: -85 + 85 = 0
0 + 2r2 = -7 + 85
2r2 = -7 + 85
Combine like terms: -7 + 85 = 78
2r2 = 78
Divide each side by '2'.
r2 = 39
Simplifying
r2 = 39
Take the square root of each side:
r = {-6.244997998, 6.244997998}
| ab+2a+2b+4= | | 221-2x=34x+21 | | 3(d+15)-18d=0 | | a^2-ab-5a-5b=0 | | 8x-13=3x+10 | | (x^2)+4x+12=0 | | 4a^7-25a^5= | | 10-5x-2y=1 | | 400a=6000 | | 2x^2-18xy+28y^2= | | y=2cos^4(9-x^2) | | 29-2c=13 | | (x-6)*2+(y+9)*2=6*2 | | -2n-4n+4=-6 | | 8x+24+2x+66=180 | | 5x+106=9x-6 | | 5=3x+6-2x | | (x/-7)-3=11 | | -8r+4(6r+3)=124 | | -6=X-2-2 | | (-9)xm=45 | | 15=-1-3x-x | | 4+35x=28x+16 | | 19+4x+3+y+25=360 | | 3x^2+3bx+3x+3b= | | -7(-4-8x)=84 | | -47-48= | | -91=7(x-7) | | 6=n+6+2n | | -10x+1=7x+37 | | 15p+18-1=17+15p | | 3x-1+2=8 |