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3x+15-10=x+13
3x-x+15-10-13
2x+15-23
2x-8
x=-8/2= -4
B) 4 x-3+2( x -1)= 3+22
2x-3+2x-2=3+22
4x-5=25
4x-5-25
4x-30
x=-30/4= -7,5
C) 7(3 + 2x) -17-10x= 29-x
21+14x-17-10x=29-x
4x+4=29-x
4x+x+4-29
5x= -25
x=-25/5= -5