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a) 4x+1=3x+5
4x-3x=5-1
x=4
b) x-3=2(x-8)-5
x-3=2x-16-5
x-3=2x-21
x-2x=-21+3
-x=-18
x=18
c)7x-1=¹/₃(x+7)
7x-1=¹/₃x+⁷/₃
7x-¹/₃x=⁷/₃+1
6²/₃x=3¹/₃
²⁰/₃x=¹⁰/₃
x=¹⁰/₃׳/₂₀
x=¹/₁₀
d)x²+3=x(x+1)+2+2
x²+3=x²+x+4
x²-x²-x=4-3
-x=1
x=-1
zadanie 11.
w załączniku