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1 - [ 5x + 10 - 7 ] = -6x - 18
1 - 5x + 10 - 7 = -6x - 18
-5x + 6x = -18 - 1 + 7 - 10
x = - 22
b) 4- 4 - [ 4 - (4 - x) ] = 4
4-4- 4-4+x = 4
x = 4 -4+4+4+4
x = 12
1-(5x+10-7)=-6x-18
1-5x-10+7=-6x-18
-5x+6x=-18+10-7+1
x=-14
b) 4- 4 - [ 4 - (4 - x) ] = 4
-4-(4-x)=4
-4-4+x=4
x=4-8
x=-4
c) - x ( 4 + x) + 3 = x ( 7 - x) + 5 ( x - 9)
-4x-x^2+3=7x-x^2+5x-45
-4x-5x-7x=-45-3
-16x=-48
x=3
1-(5x+10-7)=-6x-18
1-5x-10+7=-6x-18
-5x+6x=-18+10-7+1
x=-14
b) 4- 4 - [ 4 - (4 - x) ] = 4
-(4-4+x)=4
-4+4-x=4
x=-4
c) - x ( 4 + x) + 3 = x ( 7 - x) + 5 ( x - 9)
-4x-x²+3=7x-x²+5x-45
48=16x :16
x=3