0.1x +8 = 0.3x -6
0.1x -0.3x = -8-6
-0.2x = -14
x = -14 / -0.2
x = 70
9p²-4=(3p-2)(3p+2)
1/36-c²=1/6-с)(1/6+с)
4x²-y²=(2x-y)(2x+y)
36²-25y²=(36-5y)(36+5y)
a²b²-9=(ab-3)(ab+3)
-a⁴+81=(3a-3)(3a+3)(9a+a)²