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Simplifying x + 3x = x + 21 Combine like terms: x + 3x = 4x 4x = x + 21 Reorder the terms: 4x = 21 + x Solving 4x = 21 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 4x + -1x = 21 + x + -1x Combine like terms: 4x + -1x = 3x 3x = 21 + x + -1x Combine like terms: x + -1x = 0 3x = 21 + 0 3x = 21 Divide each side by '3'. x = 7 Simplifying x = 7
| 7v=8(v-7) | | 36x^2-23=121 | | 2(x-5)=9x | | 7x-2(x-4)=5x+2 | | 9x=2(x-5) | | 3(x-12)=9(x-4) | | 10r=35 | | 9x^2-24x+36=0 | | 6(4x-7)=3(8x+5) | | -29=x-47 | | 3(b+2)=9b | | 20x-42=24x+15 | | 9(n-6)=6n | | n(n-6)=9 | | 14z-4y= | | 3x+5-6x=2+8x-6 | | nn-6=9 | | 19x+3=5-6x | | a-45=12 | | -2p+7=6-(10p+4) | | 3+b=.5 | | 40x+2(1.5)=430 | | x+100+500=x | | f=-2x^2+9x+7 | | 5=ln(x+8) | | 0.45+.05(16-x)=.10(24) | | 40=250*r | | 3x-7+2x+5=108 | | 40=250xr | | x^2+2x-4= | | x=-2x^2+9x+7 | | 7-n=19 |