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bonjour
24 x + 12 ( x - 2 ) + 12 ( x - 5 ) = 540
24 x + 12 x - 24 + 12 x - 60 = 540
48 x = 540 + 24 + 60
48 x = 624
x = 13
5 x + 4 = 3 x + 12
5 x - 3 x = 12 - 4
2 x = 8
x = 4
bonjour
24 x + 12 ( x - 2 ) + 12 ( x - 5 ) = 540
24 x + 12 x - 24 + 12 x - 60 = 540
48 x = 540 + 24 + 60
48 x = 624
x = 13
5 x + 4 = 3 x + 12
5 x - 3 x = 12 - 4
2 x = 8
x = 4