Résoudre 4x - 7 = 25 2) Résoudre 3x+10=21 3) Résoudre 4(2x + 9) = 54 4) Résoudre 3x + 9 = 2x + 20 5) Résoudre 10x - 5 = 7x + 4 pourriez-vous m aider svp
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bonsoir,
4x - 7 = 25
4x = 25+7
4x = 32
x= 32/4
x = 8
2 3x+10=21
3x= 21-10
3x = 11
x= 11/3
3) 4(2x + 9) = 54
8x +36 =54
8x = 54-36
8x = 18
x = 18/8
x = 9/4
4) 3x + 9 = 2x + 20
3x-2x = 20-9
x = 11
5) 10x - 5 = 7x + 4
10x-7x = 4+5
3x = 9
x= 9/3
x = 3