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Simplifying 5 + 2(x + -1) = 21 Reorder the terms: 5 + 2(-1 + x) = 21 5 + (-1 * 2 + x * 2) = 21 5 + (-2 + 2x) = 21 Combine like terms: 5 + -2 = 3 3 + 2x = 21 Solving 3 + 2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + 2x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 2x = 21 + -3 2x = 21 + -3 Combine like terms: 21 + -3 = 18 2x = 18 Divide each side by '2'. x = 9 Simplifying x = 9
| x*lnx-18=0 | | 2t^2-16t+8=0 | | x^2-40x=18 | | P=11+x-11+1+10+8+x-3 | | 8-6=7k | | 7x+6x=39 | | 16/7x=-16/27 | | 750-50x=35x-185 | | 750+50x=35x-185 | | 750-85x=185-35x | | 66.8-x=30 | | 40/1/2-40 | | (12x2)/6+10-5 | | 24+24+24+2=75 | | -5(-4x+4y)=20 | | -4x+4y=20 | | 28x-28y=56 | | 3x-4y=2z-5 | | 1-1/13=12/13 | | 7+4y=z+3 | | z^2+11z+24=(z+8)(z+3) | | 1-1/13 | | 4(3a+5)=9(9a-5)+12a | | 5x+10y+5z=25 | | 76-5x=13x+18 | | 1/3(2x-7)=8 | | 2a+3a-(2a+2)=a+2 | | 0=17r | | 145=60 | | 3x-7/3x+5=4/5 | | h+2=33 | | 12-k=20 |