III. TÌM X Bài 1: Tìm x: 93 – x = 27 x + 19 = 301 89 – (73 – x) = 20 (x + 7) – 25 = 13 198 – (x + 4) = 120 2(x- 51) = 2.23 + 20 450 : (x – 19) = 50 4(x – 3) = 72 – 110 140 : (x – 8) = 7 4(x + 41) = 400 11(x – 9) = 77 5(x – 9) = 350 2x – 49 = 5.32 200 – (2x + 6) = 43 135 – 5(x + 4) = 35 25 + 3(x – 8) = 106 32(x + 4) – 52 = 5.22 Bài 2: Tìm x: 10x + 65 = 125 15 + 5x = 40 5x + x = 150 : 2 + 3 6x + x = 511 : 59 + 31 4x + 2x = 68 – 219 : 216 5x + x = 39 – 311:39 7x – x = 521 : 519 + 3.22 - 70 7x – 2x = 617: 615 + 44 : 11 3x = 9 4x = 64 2x = 16 9x- 1 = 9 x4 = 16 2x : 25 = 1

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