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4*(1/2)²-3*5⁰
4*1/4-3*5
4/4-15=1-15=-14
6)2x+y=5
y=x+2 ------------------------------ > y=x+2
2x+x+2=5 y=1+2=3
3x=5-2
3x=3/:3
x=1
7) (7+13+8+8+6):6=42:6=7