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3x=56:7
3x=8/:3
x=8/3
spr.56:(3*8/3)=56:8=7
2)-4x=7/:(-4)
x=-7/4
spr.-4*(-7/4)=7
3)64-5x=8 (chyba tak to miało byc,bo jakoś dziwnie to napisane)
-5x=8-64
-5x=-56/:(-5)
x=56/5
spr.64-(5*56/5)=64-56=8