about maths 7 class ex 12.3 6 main
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(i) x + 7 + 4 (x - 5) = x + 7 + 4x - 20
= x + 4x + 7 - 20
= 5x - 13
= (5 x 2) - 13
= 10 - 13
= -3
(ii) 3 (x + 2) + 5x - 7 = 3x + 6 + 5x - 7
= 3x + 5x + 6 - 7 = 8x - 1
= (8 x 2) - 1
=16 - 1 =15
(iii) 6x + 5 (x - 2) = 6x + 5x - 10
= 11x - 10
= (11 x 2) - 10
=22 - 10 = 12
(iv) 4 (2x - 1) + 3x + 11 = 8x - 4 + 3x + 11
= 11x + 7
= (11 x 2) + 7
=22 + 7 = 29
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