+) 20^2 - 4( x + 41 ) = 2 x 10^2 +) 10 + 2x = 4^5 : 4^3
(=) 400 - 4x - 164 = 2 x 100 (=) 10 + 2x = 4^2 = 16
(=)-4x = -400 + 164 + 200 (=) 2x = 16 - 10 =6
(=)-4x = -36 =) x = 3
=) x = 9
+) 150 + 5(x - 9) = 350 +) 2x - 138 = 2^3 x 3^2
(=) 150 + 5x - 45 = 350 (=) 2x - 138 = 8 x 9 = 72
(=) 5x = 350 - 150 + 45 (=) 2x = 72 + 138 = 210
(=) 5x = 245 =) x = 105
=) x = 49
+) 5^3 - 5(x + 4) = 35 +) 5^2 + ( 177 - x ) = 3^2 x 2^2
(=) 125 - 5x - 20 = 35 (=) 25 + 177 - x = 6^2 = 36
(=) -5x = 35 - 125 + 20 (=) -x = 36 - 25 -177
(=) -5x = -70 (=) -x = -166
=) x = 14 =) x = 166