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Simplifying X + (X + -21) = 87 Reorder the terms: X + (-21 + X) = 87 Remove parenthesis around (-21 + X) X + -21 + X = 87 Reorder the terms: -21 + X + X = 87 Combine like terms: X + X = 2X -21 + 2X = 87 Solving -21 + 2X = 87 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '21' to each side of the equation. -21 + 21 + 2X = 87 + 21 Combine like terms: -21 + 21 = 0 0 + 2X = 87 + 21 2X = 87 + 21 Combine like terms: 87 + 21 = 108 2X = 108 Divide each side by '2'. X = 54 Simplifying X = 54
| Y-8=3/8(x-3) | | -4(b-x)= | | .028=3.484x+.042 | | 13+2x=-x-8 | | .011=3.484x+.042 | | 27x^2-300=0 | | 6x-3(4x-5)=-4x-11 | | 4x/8*-3=-2 | | f(x)=4x^2+6x-5 | | Y-1=2/5(x-5 | | -7h=77 | | .013=3.484x+.042 | | 5/6-(-2/3) | | -20=-12-f | | X*0.45=180 | | Y-4=3/2(x-2) | | 1/2x-1/2=2 | | 5x^2+45x+30=0 | | .022=3.484x+.042 | | -36=3d | | 5x-15=9x-13 | | 2x^2+25x-58=0 | | .018=3.484x+.042 | | -8=s-3 | | 3(c-9)= | | 3x^1/5=12 | | -4=-9+z | | 7=u+10 | | 3x(x+8)=66 | | -36=6r | | .008=3.484x+.042 | | 7=x-14 |