287-x+124=149
287-x=149-124
287-x=25
x=287-25
x=262
1) 35+23+x=100
58+ x=100
X=100-58
X=42
2)70-a=8+9+2
70-a=19
A=70-19
A=51
3)a+(45-30)=75
A+5=75
A=75-5
A=70
4)x-(23+17)=60
X-40=60
X=60-40
X=20
5)(30-15)+y=80
15+y=80
y=80-15
y=65
6)x+12=50-(15+5)
X+12=30
X=30-12
X=18
1.<span>(-16):(-4)+(-51):3=71
2. <span>(-1,8+3,4-2,2):50=2.20
3. <span>((-7)*3,5+20)*(0,6)=0,6
4. <span>((71-3,8*(-1,5)):(-1,3)=1,3</span></span></span></span>
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