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4x+1=3x+5
4x-3x=5-1
x=4
b) x-3+5=2(x-8)
x-3+5=2x-16
x-2x=-16-5+3
-x=-21+3
-x=-18 /:(-1)
x=18
c) (7x-13)3=x+7
21x-3=x+7
21x-x=7+3
20x=10 /:20
x=0,5
d) x2+3-2=x(x+1)+2
x2+3-2=x2+x+2
x2-x2-x=2-3+2
-x=1 /:(-1)
x=-1