a)7(x-2)=5(x+3) b)3(2x-1)=-2(x+3) c)5x-3(x+2)=15 d)2x+3x+9=8(6-x)
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a)7(x-2)=5(x+3)
7x - 14 = 5x + 15
7x - 5x = 15 + 14
2x = 29
x = 29/2 ou 14,4
S{29/2}
b)3(2x-1)=-2(x+3)
6x - 3 = - 2x - 6
6x + 2x = - 6 + 3
8x = - 3
x = - 3/8
S{-3/8}
c)5x-3(x+2)=15
5x - 3x - 6 = 15
5x - 3x = 15 + 6
2x = 21
x = 21/2
S{21/2}
d)2x+3x+9=8(6-x)
2x + 3x + 9 = 48 - 8x
2x + 3x + 8x = 48 - 9
13x = 39
x = 39/13
x = 3
S{3}
7x - 14 = 5x + 15
7x - 5x = 15 + 14
2x = 29
x = 29/2 ou 14,4
S{29/2}
b)3(2x-1)=-2(x+3)
6x - 3 = - 2x - 6
6x + 2x = - 6 + 3
8x = - 3
x = - 3/8
S{-3/8}
c)5x-3(x+2)=15
5x - 3x - 6 = 15
5x - 3x = 15 + 6
2x = 21
x = 21/2
S{21/2}
d)2x+3x+9=8(6-x)
2x + 3x + 9 = 48 - 8x
2x + 3x + 8x = 48 - 9
13x = 39
x = 39/13
x = 3
S{3}
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