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7x=0
x=o
b)5x=-4 /:5
x=-4/5
c)4x-5=7 /+5
4x=12 /:4
x=3
2x+3x+2x= -21+18+3
7x=0/:7
x=0
b) 2(x+1)+3(x-2)= -4
2x+2+3x-6=-4
2x+3x=-4+6-2
5x=0/:5
x=0
c) x+(3x-5)=7
x+3x-5=7
4x-5=7
4x=7+5
4x=12/:4
x=3
2x+3x+2x=-21+18+3
7x=0 /:7
x=0
b)2(x+1)+3(x-2)=-4
2x+2+3x-6=-4
2x+3x=-4-2+6
5x=0 /:5
x=0
c)x+(3x-5)=7
x+3x-5=7
x+3x=7+5
4x=12 /:4
x=3
//Proszę bardzo ;).