a) 25 - (3 * x - 4) - 2 = 18 b) 256 - ( x + 71 ) = 92 c) ( x - 45 ) - 320 = 0
25 - (3 * x - 4) = 18 + 2 x + 71 = 256 - 92 x - 45 = 0 + 320
25 - (3 * x - 4) = 20 x + 71 = 164 x - 45 = 320
3 * x - 4 = 5 x = 164 - 71 x = 320 + 45
3 * x = 5 + 4 x = 93 x = 365
3 * x = 9
x = 9 : 3
x = 3
d) x : 45 = 346 e) 3270 : x = 15
x = 346 . 45 x = 3270 : 15
x = 15570 x = 218
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