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а) 37 + (2х – 3) = 98; 2х – 3 = 98 – 37; 2х = 61 + 3; 2х = 64; х = 64 : 2; х = 32. б) 135 – 3(х – 7) = 105; 3(х – 7) = 135 – 105; х – 7 = 30 : 3; х = 10 + 7; х = 17. в) 1024 : (12 + 4х) – 25 = 7; 1024 : (12 + 4х) = 7 + 25; 12 + 4х = 1024 : 32; 4х = 32 – 12; х = 20 : 4; х = 5. г) 35(2х + 99) + 53 = 3800; 35(2х + 99) = 3800 – 125; 2х + 99 = 3675 : 35; 2х = 105 – 99; 2х = 6; х = 3.