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x=7+5
x=12
b)2x+1=4
2x=4-1
2x=3/:2
x=1,5
c) 4x-3=5x-1
4x-5x=-1+3
-x=2/:-1
x=-2
d)3-(4x+2)=5(x-3)
-12x-6=5x-15
-17x= -11 /:-17
x= 0.6470588235 w przybliżeniu x≈0.65
x=7-5
x=2
b)2x+1=4
2x=4-1
2x=3/:2
x=1,5
c)4x-3=5x-1
4x-5x=-1+3
-x=2/*(-1)
x=-2
d) 3-(4x+2)=5(x-3)
3-(4x+2)=5x-15
3-4x+3-2=5x-15
-4x-5x=-15-3-3+2
-9x=-19/*(-1)
9x=19/:9
x=2 1/9