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90+x=90
We move all terms to the left:
90+x-(90)=0
We add all the numbers together, and all the variables
x=0
| 2x+1.7+x2.4=180+x2.4 | | 3x^{2}-10=80 | | x⁴=100 | | -2/3x-5=12 | | |10-2x|+6=20 | | z=z-42 | | z-42=z | | (5.6-y)-y=1.8 | | -12x+3=-27 | | 25+2a=42 | | x²+12x-50=0 | | 6=2√x(64) | | 3600=2x^2 | | 1/7y-5=-7 | | 6(x–12)+2x=8(x–9) | | 6^x+3^x=9^x | | 9t^2-50t+25=0 | | 6t+3=3t=15 | | 165=2x+5 | | 2x–1=19–3x | | z^2=1.4/10.2 | | 55=2x+5/3 | | A=2x³-4x²=x-2 | | 9t^2-1250t+625=0 | | 2x-20=2(3x+2) | | 28-5=2+3(3x) | | 5x+35=3(5x+5) | | 9/n=75/100 | | 3x-12=5(3x-4)-4 | | x+9,5=81/x | | 20n+59=10n+69 | | 25^3x/5^2=125^2 |