X + X + 3 = (10X + X + 3)/4

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X + X + 3 = (10X + X + 3)/4
X + X + 3 = (10X + X + 3)/4

X + X + 3 = (10X + X + 3)/4
4(2x+3)=10x+x+3
8X+12=11X+3
-3X=-9
X=3

X+X-3 = 1/4[10X+(X-3)]
2x-3=1/4(10x+x-3)
2x-3=1/4(11x-3)
2x-3=11x/4-3/4
2x-3=2.75x-0.75
0.75x=-2.25
x=-3

8X+12=11X+3
-3X=-9
X=3

x+x+3=(10x+x+3)/4
4(2x+3)=11x+3
8x+12=11x+3
12-3=11x-8x
9=3X
x=3

X + X + 3 = (10X + X + 3)/4
2x+3=(11x+3)/4
11x+3=(2x+3)×4
11x+3=8x+3×4
11x-8x=12-3
3x=9
x=9÷3
x=3