Odpowiedź:
a) 2x-12+2+5x-10-3x-12 = 0
4x-32 = 0
4x = 32 /:4
x = 8
spr.: 2(8-6)+2+5(8-2)-3(8+4) = 0
2*2+2+30-3*12 = 0
4+32-36 = 0
0 = 0
b) x+7/8 = x+8/7 /*8
8x+7 = 7x+64/7
8x-7x = 64/7-7
x = 9 1/7-7
x = 2 1/7
