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5x-7=6x-12
5x-6x=7-12
-x=-5/*(-1)
x=5
b) 1/2x-2,5=4x-20 /*2
x-5=8x-40
x-8x=5-40
-7x=-35/:(-7)
x=5
c) 5+x=x+2(1-x)
5+x=x+2-2x
x+2x-x=-5+2
2x=-3/:2
x=-3/2
x=-1i1/2
d) 3(x+1)-6(x+2)=8(x-1)
3x+3-6x-12=8x-8
3x-6x-8x=-3-8+12
-11x=1/:(-11)
x=-1/11
a)
5x - 7 = 6(x-2)
5x - 7 = 6x - 12
5x - 6x = -7 - 12
-1x = -19↑:(-1)
x = 19
b)
x -2,5 = 4x -20 ↑ ·2
x - 5 = 8x - 40
x - 8x = -5 - 40
-7x = -45 ↑ :(-7)
x= 9
c)
5 + x = x +2(1-x)
5 +x = x +2 - 2x
x - x + 2x = -5 +2
2x = -3 ↑:2
x = 1,5
d)
3(x+1) - 6(x+2) = 8(x-1)
3x + 3 - 6x + 12 = 8x - 8
3x - 6x - 8x = -3 - 12 - 8
-11x = -23 ↑:(-11)
x =
x = 2