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x+40=100
x=60
b) 3+ x/3 =4 |*3
9+x=12
x=3
c) 3(x-5)+9
3x-15+9
3x=6 |;3
x=2
d) 4(x+1)=-8
4x+4=-8
4x=-12 |;4
x=-3
e) 2x+5+x-2=12
3x=7 |:3
x=7/3 = x=2 i 1/3
f) -3x-1+5x+7=0
2x=-6 |;2
x=-3
g) 4x+7-x+2=9
3x=0 |;3
x=0
i) 3x-4=5x
-4=2x |;2
x=-2
j) -2x+7x+18
5x=-18 |;5
x=-18/5 x=-3 i3/5
k) 6x+4=2x
4=-4x |;(-4)
x=-1
l) -2x+7+6x-9
4x+=2 |;4
x=2/4 x=1/2
m) -4x+5=25-9x
5x=20 |;5
x=5