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0,12x- 0,36 +0,36 = 0,6
0,12x=0,6 /:0,12
x = 5
9x+6-(3x-4)(x+2) = 36 -3x²
9x + 6 -3x² - 6x + 4x + 8=36- 3x²
7x= 36- 8 - 6
7x= 22
x= 3,14285714 lub 3 i jedna siódma ;p
0,3(0,4x - 1,2) +0,36= 0,6
0,3+ 0,12x- 0,36 +0,36= 0,6
0,3+ 0,12x =0,6 /-0,3
12x= 0,6 /:12
x= 0,05
A drugie:
9x+6-(3x-4)(x+2)=36-3x²
9x+6-(3x-4)(x+2)=36-3x × 3x
9x+6-(3x+x)(-4+2)=36 -3x × 3x
9x+6-4x-2=36-3x × 3x
5x+4=36-9x /-4
5x=32-9x /-9x
(-4x)=32 /:4
x=8