If it's not what You are looking for type in the equation solver your own equation and let us solve it.
(21-4)(21+a)=126+1
We simplify the equation to the form, which is simple to understand
(21-4)*(21+a)=126+1
Simplifying terms in parentheses
(+17)*(21+a)=126+1
Reorder the terms in parentheses
multiplication of parentheses
(+357+17a)=126+1
Remove unnecessary parentheses
+357+17a=126+1
We move all terms containing a to the left and all other terms to the right.
+17a=+126+1-357
We simplify left and right side of the equation.
+17a=-230
We divide both sides of the equation by 17 to get a.
a=-13.5294117647
| 28=18+5d | | 10a-35=-8a+1 | | x(x)-5x+4=x(x)+3x+52 | | 9(x+y)-3(2x-5y)= | | 25x^3+40x^2-9x=0 | | 2+2x-4=3x+27 | | -4-3x=-6-6 | | X^2+4=x^2+x | | -4d+6=12 | | -15p-4(2-5p)=3(p-2)-14 | | 4+12x=13x+-5 | | 0.3x+1.2=0.2(x-4) | | 9x^2+27x+5=0 | | 2p-4=2 | | 8n+-3=9 | | 12+3x=7x | | 8.2x+75.79=-11.8x+75.61 | | 10-5+1=7x+11-12x | | x+(-15)=3 | | Y=-2x+34 | | 6x^2-y^2-1=0 | | 4+7x=7-3x | | 42+.05x=42+.08x | | 1/2=-14 | | 2(x+12)+6x-20=180 | | -3(x-5)-(2x-6)+1=-5(x-1)-3(x+2)+3 | | 7.2x-1.4=20.2 | | 8p-5p+5-p-2= | | 4x-16+116=180 | | 3x-7=5x-19 | | 6+(1+9)=(6+1)+9 | | 2(a-4)=4a+-1(2a+4) |