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hey mate here's ur ans
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(a) x = 7
(b) x = 3
(c) x = -17/27
(d) x = -9
(e) x = 12
Step-by-step explanation:
(a) 7 + 5x + 3x = 21
=> 7 + 2x = 21
=> 2x = 21-7 = 14
=> x = 14/2 = 7
(b) 1.2x + 1.8x =18
=> 6x = 18
=> x = 18/6 = 3
(d) 4 - 4(x-5) = 2(2-x) - 6
=> 4 - 4x - 20 = 4 - 2x - 6
=> -16 - 4x = -2 - 2x
=> -4x + 2x = 16 + 2 = 18
=> -2x = 18
=> x = 18/-2 = -9
(e) 12 - x/5 = x
=> 12-x = x*5
=> 12-x = 5x
=> -x-5x = -12
=> -6x = -12
=> 6x = 12
=> x= 12/6 = 2
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