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2010-02-11T18:57:43+01:00
D)-(2x-1)=4
-2x +1 = 4
-2x = 4-1
-2x = 3 / : (-2)
x = -³/₂
x = -1½

e)2(x+1)=x
2x+2 = x
2x - x = -2
x = -2

f)2t-(3t+1)=6
2t-3t-1 = 6
2t-3t = 6+1
-t = 7 / :(-1)
t = -7

g)-(4+x)=2(3-x)
-4-x = 6 - 2x
-x+2x = 6+4
x = 10

h)3(y+6)-y=2(y+9)
3y+18-y = 2y+18
3y - y-2y = 18-18
0=0

i)(x-7)-2(3x+5)=3
x-7-6x-10 = 3
x-6x = 3+7+10
-5x = 20 / :(-5)
x = -4