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x=55
b)2x=87 /:2
x=43,5
c)1/3x=12 / *3
x=36
d)x+5=2(x+1)
x+5= 2x+2 /-x
5=x+2 /-2
3=x
x=70-15
x=55
b) 87=2x |:2
43,5=x
c) x/3=12 | *3
x=36
d) x+5=2(x+1)
x+5=2x+2
5-2=2x-x
3=x
x=70-15
x=55
b) 2x=87
x=87:2
x=43,5
c) x:3=12
x=12*3
x=36
d) a na d ci już nie odpowiem bo zbytnio nie kminie :/