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2x+48-4x=30
2x-4x=30-48
-2x= -18/:(-2)
x=9
spr
2*9+4*(12-9)=30
18+48- 36*=30
30=30
2x + 48 - 4x = 30
-2x + 48 = 30
-2x = 30 - 48
-2x = -18 //:(-2)
x = 9
sprawdzenie:
2 * 9 + 4 * (12 - 9) = 30
18 + 4 * 3 = 30
18 + 12 = 30
30 = 30
L = P