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-5x +21 = 2x + 10
-5x-2x=-21+10
-7x=-11/-7
x=-11/-7
3x-12-8x+28=2x+10
3x-8x-2x=10-28+12
7x=6 /:7
x=6/7
b)2(2x-3)+3(4-x)=-(x-1)
4x-12+12-3x=-x+1
4x+x-3x=-12+12+1
2x=1 /2
x=1/2
c)2(x-3)-4(3+x)=-3(x+5)-2(2x+3)+4(2x-1)
2x-6-12-4x=-3x-15-4x-6+8x-4
2x-4x+3x+4x-8x=-15-6-4+6+12
-3x=-7 /-3
x=7/3=2 1/3
d)6(4-x)+5(2x-5)=4(x-1)-3(4-x)
24-6x+10x-25=4x-4-12+3x
-6x+10x-4x-3x=-24+25-4-12
-3x=-15 /-3
x=5