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Simplifying x + (x + 1) = 21 Reorder the terms: x + (1 + x) = 21 Remove parenthesis around (1 + x) x + 1 + x = 21 Reorder the terms: 1 + x + x = 21 Combine like terms: x + x = 2x 1 + 2x = 21 Solving 1 + 2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + 2x = 21 + -1 Combine like terms: 1 + -1 = 0 0 + 2x = 21 + -1 2x = 21 + -1 Combine like terms: 21 + -1 = 20 2x = 20 Divide each side by '2'. x = 10 Simplifying x = 10
| 10x+18x^2= | | 10x-5x+x=-1 | | y=-x^2+8x | | -5(3-z)=z+1 | | 2t+8t=40 | | 0.18(y-4)+0.10y=0.12y-0.05(40) | | 2x^3-2X^2-4x=0 | | 2(w+2)+2w=24 | | -6m^2=90 | | (5x+1)-2(4x+1)=0 | | 15x^2-14=29x | | 3x^2-8x+1.2=0 | | 3n+17=4n+16 | | 1-3x=2x-9 | | 36p^2=9 | | 5s^2-36s-32=0 | | k^2+6=31 | | y^2-18y+81=0 | | 2m/3+1/2=m/2 | | 4y^2+16x+7=0 | | w^2=40-3w | | n^2-4=60 | | k^2+1=-16 | | 2x+2=-20 | | 4x+5=2x-1 | | m/5=5 | | 4y^2-8y-5=0 | | 9n^2+6n-3=0 | | 4(3+2x)+8=92 | | X^2+8-5=0 | | b^2+8=44 | | n^2-2n-1=0 |